Feasibility and Preliminary Efficacy of a “Sit Less” Program Leveraging Fitbit Tracking and Tailored Text Messages in Cardiometabolic Disease: Findings From 2 Parallel Randomized Controlled Trials in Coronary Artery Disease and Type 2 Diabetes
Open accessAbstract
Background: Individuals with cardiometabolic disease typically average 10 to 14 hours of daily sedentary time, which increases the risk of cardiovascular disease. Objective: This study aimed to evaluate the feasibility, acceptability, and preliminary efficacy of a “Sit Less” program in reducing sedentary behavior in people with cardiometabolic disease. Methods: Participants with cardiovascular disease or type 2 diabetes underwent separate randomization into the Sit Less intervention or the control group. Sit Less included 1 in-person counseling session, a Fitbit, a smart water bottle, and tailored weekly text messages for 12 weeks. Control group participants received the American Heart Association’s “Answers by Heart” booklet. Sedentary behavior was measured using the activPAL for 7 days at baseline and postintervention. The secondary outcomes included physical activity, cardiometabolic biomarkers, continuous glucose monitoring metrics, and psychological factors. Generalized linear models estimated adjusted between-group differences, controlling for baseline values, cohort, cohort×group interaction, and leisure-time exercise. Results: Of the 37 randomized participants, 35 (95%) completed the study (Sit Less: n=17, 48.6%; and control: n=18, 51.4%). Of the 35 participants who completed the study, 62% (n=21) were men, the median age was 67 (54-72) years, and their baseline sedentary time was approximately 10.4 hours per day. Sit Less participants demonstrated high adherence, including a text response rate of 81% and a median Fitbit wear time of 15 hours per day on 6.8 days per week, and 15 (88%) of 17 participants reported satisfaction with the program. Compared with the control group, Sit Less participants showed greater reductions in total sedentary time (adjusted mean difference −17.3 min/d, 95% CI −63 to 28; P=.45) and prolonged sedentary time of >30 minutes (−39.5 min/d, 95% CI −100 to 21; P=.20) and >60 minutes (−49.9 min/d, 95% CI −102 to 2; P=.06) and increases in sit-to-stand transitions (4.2 per day, 95% CI −2 to 10; P=.13), although none were statistically significant. Hemoglobin A1c was lower in the Sit Less group than in the control group (adjusted mean difference −0.4%, 95% CI −0.8 to −0.1; P=.04). Continuous glucose monitoring outcomes, including mean glucose (−6.0 mg/dL, 95% CI −14.9 to 2.8; P=.18) and time in range (2.1%, 95% CI −4.8 to 9.1; P=.54), were not statistically significant but demonstrated similar directional changes. Other cardiometabolic biomarkers, physical activity, and psychological outcomes were not significantly different, except for lower self-efficacy for moderate physical activity in the Sit Less group (−0.6, 95% CI −1.1 to −0.2; P=.003). Conclusions: The Sit Less intervention was feasible and acceptable and showed possible improvements in sedentary behavior and glycemic outcomes. Although this pilot study had a small sample size and limited statistical power, with multiple outcomes examined and wide CIs observed, these findings support evaluation in larger, adequately powered trials. Trial Registration: ClinicalTrials.gov NCT05534256; https://clinicaltrials.gov/study/NCT05534256 and ClinicalTrials.gov NCT05691452; https://clinicaltrials.gov/study/NCT05691452 International Registered Report Identifier (IRRID): RR2-10.1371/journal.pone.0302582
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Written from the paper’s full text.
TL;DR
In two parallel pilot RCTs, a 12-week multitechnology “Sit Less” program using Fitbit, a smart water bottle, and tailored texts was feasible and acceptable in adults with coronary artery disease or type 2 diabetes. Sedentary-behavior changes favored Sit Less but were not statistically significant; HbA1c was significantly lower in the Sit Less group.
Key findings
- Feasibility and acceptability were high: 35/37 (95%) completed the study; text response rate averaged 81%; median Fitbit wear was 15 hours/day on 6.8 days/week; 15/17 (88%) Sit Less participants reported satisfaction.
- Sedentary outcomes favored Sit Less but were nonsignificant: total sedentary time adjusted mean difference −17.3 min/d (95% CI −63 to 28; P=.45); >30-minute bouts −39.5 min/d (95% CI −100 to 21; P=.20); >60-minute bouts −49.9 min/d (95% CI −102 to 2; P=.06); sit-to-stand transitions 4.2/day (95% CI −2 to 10; P=.13).
- HbA1c was lower in Sit Less than control (adjusted mean difference −0.4%, 95% CI −0.8 to −0.1; P=.04); CGM outcomes were directionally similar but nonsignificant, including mean glucose −6.0 mg/dL (95% CI −14.9 to 2.8; P=.18) and time in range 2.1% (95% CI −4.8 to 9.1; P=.54).
- Self-efficacy for moderate physical activity was lower in Sit Less than control (−0.6, 95% CI −1.1 to −0.2; P=.003); other psychological and cardiometabolic outcomes were not significantly different.
Methods
- Two parallel randomized controlled pilot trials in separate cohorts (coronary artery disease/CVD and type 2 diabetes), each with 1:1 randomization to a 12-week Sit Less intervention or control receiving the American Heart Association “Answers by Heart” booklet.
- Sit Less included one in-person counseling/goal-setting session, a Fitbit, a HidrateSpark smart water bottle, and 3 tailored weekly text messages; outcomes included activPAL3-measured sedentary behavior and physical activity over 7 days at baseline and postintervention, CGM, dried-blood-spot HbA1c, cardiometabolic biomarkers, and psychological surveys.
- Generalized linear models estimated adjusted between-group differences controlling for baseline values, cohort, cohort×group interaction, and leisure-time exercise, with robust SEs; analyses were intention-to-treat without imputation.
Limitations
- The paper states the pilot was small and underpowered, with wide CIs and multiple outcomes examined; the HbA1c finding should be interpreted cautiously, and the study cannot estimate differential treatment effects between CVD and T2D cohorts.
- The paper states limited generalizability: recruitment from a single Nashville hospital, predominantly White and highly educated participants, and baseline HbA1c mostly in the nondiabetic/well-controlled range with no participants >7.0%.
- The paper states mechanisms could not be determined and smart water bottle use was not objectively measured; evident from the text, baseline leisure-time exercise differed significantly between groups (82% Sit Less vs 39% control; P=.009) and baseline stepping time also differed (P=.01), though models adjusted for these factors.
Model-written summary. Check it against the paper before relying on it.
Integrity signals
Registry
Cites
Statistics
Claims the paper makes
23 of 42 cited sources checked · 5 supported · 1 flagged · accuracy not yet measured
- Premisecitation
Sedentary behavior is a strong modifiable risk factor for cardiometabolic disease.
“Sedentary behavior is a strong modifiable risk factor for cardiometabolic disease [1,2].”
Quote in the paperSubstantial claim1 of 2 sources checked- cites [1] source
The Discussion (page unavailable) reports dose-response associations between sedentary behavior and cardiovascular disease risk in older women and discusses reducing sedentary time. It does not establish sedentary behavior as a causal risk factor for cardiometabolic disease generally; the study’s conclusion is limited to associations with cardiovascular disease in older women. (LLM, conf=0.85)
Experimental — accuracy not yet measured - cites [2] source
- Premisecitation
Prolonged sedentary time is associated with a 12% higher risk of incidental cardiovascular disease independent of physical activity levels.
“Prolonged sedentary time is also associated with a 12% higher risk of incidental cardiovascular disease (CVD) independent of physical activity levels [1].”
Quote in the paperSubstantial claim1 of 1 sources checked- cites [1] source
The Results (page not provided) report a 12% higher CVD risk per additional hour of sedentary time in older women. The association remained significant after adjustment for moderate-to-vigorous physical activity, but was attenuated; the paper does not establish that the 12% estimate itself is independent of physical activity. It also reports a different estimate for prolonged sedentary bouts. (LLM, conf=0.89)
Experimental — accuracy not yet measured
- Premisecitation
To detect a feasibility issue that has a 10% likelihood of occurrence, a sample size of 30 participants is required to identify the feasibility issue with a 95% CI.
“According to Viechtbauer et al [19], to detect a feasibility issue that has a 10% likelihood of occurrence, a sample size of 30 participants is required to identify the feasibility issue with a 95% CI.”
Quote in the paperSubstantial claim1 of 1 sources checked- cites [19] source
Section 3 states that screening 29 participants is sufficient to be 95% confident of encountering at least one problem that occurs with at least 10% probability. Thirty participants would also suffice, but the paper does not say 30 are required. The 95% figure is a probability of detecting the problem, not a confidence interval for its identification; the paper discusses confidence intervals separately in Additional information. (LLM, conf=0.88)
Experimental — accuracy not yet measured
- Premisecitation
Patients with cardiometabolic diseases, including coronary artery disease or diabetes, spend 70% to 90% of their waking time in sedentary behavior.
“patients with cardiometabolic diseases, including patients with coronary artery disease or diabetes, spend 70% to 90% of their waking time in sedentary behavior [7-9]”
Quote in the paperSubstantial claim2 of 3 sources checked- cites [7] source
- cites [8] source
The Results (Accelerometry Determined Physical Activity and Sedentary Behavior; page unavailable) report 9.8–10.3 sedentary hours per day among adults with cardiovascular disease, out of 14.2–14.5 hours of accelerometer wear during waking hours—roughly 70%. The study includes coronary heart disease, but does not report this measure for patients with diabetes or establish the upper end of the claimed 70%–90% range. (LLM, conf=0.86)
Experimental — accuracy not yet measured - cites [9] source
The Introduction says adults spend a majority of their waking day sedentary, and the Discussion reports that cardiac rehabilitation patients spend an average of 50%–70% of their waking day sedentary. Neither passage supports the claimed 70%–90% range for patients with cardiometabolic diseases, including coronary artery disease or diabetes. (LLM, conf=0.86)
Experimental — accuracy not yet measured
- Premisecitation
A recent meta-analysis, while accounting for total sedentary time and moderate-to-vigorous physical activity time, revealed that even a single break per hour can modestly improve BMI, waist circumference, inflammation, and blood pressure.
“A recent meta-analysis, while accounting for total sedentary time and moderate-to-vigorous physical activity time, revealed that even a single break per hour can modestly improve BMI, waist circumference, inflammation, and blood pressure [12,13].”
Quote in the paperSubstantial claim2 of 2 sources checked- cites [12] source
The Results synthesis–observational studies (p. 1802) reports modest associations between more breaks and lower BMI and waist circumference. It reports no detected association for cardiovascular or inflammatory markers, apart from one study’s C-reactive protein finding. The paper therefore does not support the claim that a single break per hour improves all four outcomes; its observational associations also do not establish improvement caused by breaks. (LLM, conf=0.89)
Experimental — accuracy not yet measured - cites [13] source
The cardiometabolic-risk section reports associations between sitting patterns, BMI and waist circumference, and the Experimental evidence section reports blood-pressure reductions when prolonged sitting is interrupted. But this paper does not report that a meta-analysis found improvements in all four outcomes after a single break per hour; in particular, it does not establish an improvement in inflammation or that break frequency. (LLM, conf=0.87)
Experimental — accuracy not yet measured
- Premisecitation
Prolonged, uninterrupted sitting is more strongly associated with adverse cardiometabolic outcomes than interrupted sitting.
“Prolonged, uninterrupted sitting is more strongly associated with adverse cardiometabolic outcomes than interrupted sitting [40,41].”
Quote in the paperSubstantial claim2 of 2 sources checked - Findingown data
Sit Less participants had a median Fitbit wear time of 15 hours per day.
“a median Fitbit wear time of 15 hours per day on 6.8 days per week”
Quote in the paperNot a substantial claim - Findingown data
Self-efficacy for moderate physical activity was lower in Sit Less than control (−0.6, 95% CI −1.1 to −0.2; P=.003).
“lower self-efficacy for moderate physical activity in the Sit Less group (−0.6, 95% CI −1.1 to −0.2; P=.003).”
Quote in the paperNot a substantial claim - Findingown data
Hemoglobin A1c was lower in the Sit Less group than in the control group (adjusted mean difference −0.4%, 95% CI −0.8 to −0.1; P=.04).
“Hemoglobin A1c was lower in the Sit Less group than in the control group (adjusted mean difference −0.4%, 95% CI −0.8 to −0.1; P=.04).”
Quote in the paperSubstantial claim - Findingown data
15 (88%) of 17 Sit Less participants reported satisfaction with the program.
“15 (88%) of 17 participants reported satisfaction with the program.”
Quote in the paperSubstantial claim - Findingown data
Sit Less participants had a text response rate of 81%.
“a text response rate of 81%”
- Also stated in: § Feasibility · plain
“The average rate of text message response over 12 weeks was 81%.”
Quote in the paperNot a substantial claim - Also stated in: § Feasibility · plain
- Findingown data
Fifteen (88%) of 17 participants indicated they would recommend the program to family and friends.
“Fifteen (88%) of 17 participants indicated that they would recommend the program to family and friends.”
Quote in the paperSubstantial claim - Findingown data
Daily median Fitbit wear time was 928 minutes per day.
“Daily median Fitbit wear time was 928 minutes per day (IQR 902‐944).”
Quote in the paperNot a substantial claim - Findingown data
13 (77%) of 17 participants would continue checking sitting hours on Fitbit.
“13 (77%) of 17 participants would continue checking sitting hours on Fitbit”
Quote in the paperSubstantial claim - Findingown data
Sixteen (94%) of 17 participants liked wearing the Fitbit monitor.
“Sixteen (94%) of 17 participants liked wearing the Fitbit monitor”
Quote in the paperNot a substantial claim - Findingown data
Adherence to the Sit Less program was high according to the study's adherence definition.
“Adherence to the Sit Less program was high according to our adherence definition (Figure 3).”
Quote in the paperSubstantial claim - Findingown data
Fifteen (88%) of 17 participants wore the Fitbit for more than 75% of the intervention period.
“Fifteen (88%) of 17 participants wore the Fitbit for more than 75% of the intervention period.”
Quote in the paperSubstantial claim - Findingown data
Sit Less participants had a median of 6.8 valid Fitbit wear days per week.
“Weekly, the Sit Less participants had a median of 6.8 valid wear days per week—where a valid day indicated wearing the Fitbit for more than 10 hours.”
Quote in the paperNot a substantial claim - Findingown data
At baseline, participants spent a median of 624 minutes sitting per day.
“On average, the participants spent a median of 624 minutes sitting (IQR 521‐686)”
Quote in the paperNot a substantial claim - Findingown data
Fifteen (88%) of 17 participants indicated the program increased awareness of their sedentary behavior.
“Fifteen (88%) of 17 participants indicated that the program increased awareness of their sedentary behavior.”
Quote in the paperNot a substantial claim - Findingown data
On average, participants wore their Fitbit for 76 of 84 days.
“On average, participants wore their Fitbit for 76 of 84 days.”
Quote in the paperSubstantial claim - Findingown data
Participants in the Sit Less group reported that wearable technology and smart water bottles were instrumental in breaking up their prolonged sitting.
“Participants in the Sit Less group also reported that wearable technology and smart water bottles were instrumental in breaking up their prolonged sitting.”
Quote in the paperNot a substantial claim - Findingown data
The dropout of 1 participant due to inaccurate Fitbit data associated with walker use highlights a limitation of wrist-worn activity monitors in this population.
“In addition, the dropout of 1 participant due to inaccurate Fitbit data associated with walker use highlights a limitation of wrist-worn activity monitors in this population.”
Quote in the paperNot a substantial claim - Findingown data
No adjusted between-group differences were observed for sedentary behavior habit strength (adjusted mean difference 0.0; 95% CI −0.7 to 0.8; P=.89).
“No adjusted between-group differences were observed for sedentary behavior habit strength (adjusted mean difference 0.0; 95% CI −0.7 to 0.8; P=.89).”
Quote in the paperNot a substantial claim - Findingown data
11/17 (65%) of participants found the smart water bottle convenient to use.
“The majority (11/17, 65%) of participants also indicated that they found the smart water bottle convenient to use.”
Quote in the paperNot a substantial claim - Findingown data
After adjustment for baseline values, cohort, cohort×group interaction, and leisure-time exercise, the Sit Less group showed a nonsignificant reduction of 17.3 minutes per day in total sitting time compared with the control group at postintervention (95% CI −63 to 28; P=.45).
“After adjustment for baseline values, cohort, cohort×group interaction, and leisure-time exercise, the Sit Less group showed a nonsignificant reduction of 17.3 minutes per day in total sitting time compared with the control group at postintervention (95% CI −63 to 28; P=.45).”
- Also stated in: § Principal Findings · plain
“Over 12 weeks, the control group increased sitting time by 5.3 minutes per day, whereas the Sit Less group reduced sitting time by 38.6 minutes per day, corresponding to an adjusted difference of −17.3 minutes per day.”
Quote in the paperSubstantial claim - Also stated in: § Principal Findings · plain
- Findingown data
11 (65%) of 17 participants indicated the Fitbit Move Alert was useful.
“11 (65%) of 17 participants indicated that the “Move Alert” from Fitbit was useful.”
Quote in the paperNot a substantial claim - Findingown data
16/17 (94%) of participants indicated that the number of text messages was "just right."
“Most participants (16/17, 94%) indicated that the number of text messages was “just right.””
Quote in the paperNot a substantial claim - Findingown data
Fifteen (88%) of 17 Sit Less participants either agreed or remained neutral about whether they would like to receive text messages for a longer period.
“Fifteen (88%) of 17 Sit Less participants either agreed (47%) or remained neutral (41%) about whether they would like to receive text messages for a longer period.”
Quote in the paperNot a substantial claim - Findingown data
13/17 (77%) of participants either agreed or were neutral that the tips and advice felt specific to them and they were motivated by the text messages.
“The majority (13/17, 77%) of participants either agreed or were neutral that the tips and advice felt specific to them, and they were motivated by the text messages.”
Quote in the paperSubstantial claim - Findingown data
For depressive symptoms (PHQ-9), the adjusted between-group difference at postintervention was not statistically significant.
“For depressive symptoms (PHQ-9), the adjusted between-group difference at postintervention was not statistically significant.”
Quote in the paperNot a substantial claim - Study design and conductown data
Of the 37 randomized participants, 35 (95%) completed the study.
“Of the 37 randomized participants, 35 (95%) completed the study (Sit Less: n=17, 48.6%; and control: n=18, 51.4%).”
- Also stated in: § Participants · plain
“Therefore, 35 (95%) of 37 participants completed the study and were included in the analysis (Sit Less: n=17; and control: n=18).”
Quote in the paperSubstantial claim - Also stated in: § Participants · plain
- Study design and conductown data
The Sit Less group had a dropout rate of 2 (11%) of 19.
“The Sit Less group had a dropout rate of 2 (11%) of 19; the reason for the dropout was privacy concerns about the Fitbit displaying text messages and incoming calls and Fitbit’s data recording errors.”
Quote in the paperNot a substantial claim - Premisecitation
50% of total sedentary time in patients with cardiometabolic diseases is prolonged (>30 min per bout).
“50% of their total sedentary time is prolonged (>30 min per bout) [7].”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [7] source
- Study design and conductown data
With the exception of leisure-time exercise, no significant baseline differences were found between groups in demographic or clinical characteristics.
“With the exception of leisure time exercise at baseline, no significant differences between groups were found in the demographic or clinical characteristics (Table 1).”
Quote in the paperNot a substantial claim - Study design and conductown data
One (5%) Sit Less participant withdrew before the intervention due to privacy concerns about the Fitbit displaying text messages and incoming calls.
“One (5%) participant from the Sit Less group completed baseline assessments but withdrew before the start of the intervention due to privacy concerns about the Fitbit displaying text messages and incoming calls.”
Quote in the paperNot a substantial claim - Study design and conductown data
Participants provided a median of 7 valid wear days at preintervention and 7 at postintervention.
“Participants provided a median of 7 valid wear days at both preintervention (IQR 7‐8) and postintervention (IQR 6‐7).”
Quote in the paperNot a substantial claim - Study design and conductown data
At baseline, 7 (39%) of 18 control and 14 (82%) of 17 Sit Less participants reported leisure-time exercise (P=.009).
“At baseline, 7 (39%) of 18 participants in the control group and 14 (82%) of 17 participants in the Sit Less group reported leisure-time exercise (P=.009).”
Quote in the paperNot a substantial claim - Study design and conductown data
We did not collect objective data on smart water bottle use (eg, refill frequency), limiting our ability to assess its independent contribution to behavioral changes.
“For instance, we did not collect objective data on smart water bottle use (eg, refill frequency), limiting our ability to assess its independent contribution to behavioral changes.”
Quote in the paperNot a substantial claim - Interpretationreasoning
The level of change in physical activity may have been insufficient to improve some cardiometabolic outcomes, including blood pressure and anthropometric measures.
“This level of change may have been insufficient to improve some cardiometabolic outcomes, including blood pressure and anthropometric measures.”
Quote in the paperSubstantial claim - Study design and conductreasoning
The small sample size limits our ability to make conclusions about the efficacy of the Sit Less intervention.
“The small sample size aligns with these goals but limits our ability to make conclusions about the efficacy of the Sit Less intervention.”
Quote in the paperSubstantial claim - Study design and conductown data
Given the very small sample size within each cohort, the study is not designed to estimate differential treatment effects between CVD and T2D.
“In addition, given the very small sample size within each cohort, the study is not designed to estimate differential treatment effects between CVD and T2D.”
Quote in the paperSubstantial claim - Study design and conductown data
We are unable to determine the mechanisms driving change in objective outcomes.
“Finally, we are unable to determine the mechanisms driving change in objective outcomes.”
Quote in the paperNot a substantial claim - Study design and conductown data
Sensitivity analyses excluding extreme outliers for HbA1c, CGM-based glucose management index, and average glucose level showed that estimated mean differences and P values changed slightly, but interpretations of the results remained the same.
“Sensitivity analyses excluding extreme outliers were conducted for HbA1c (n=1 control), CGM-based glucose management index (n=2 controls), and average glucose level (same 2 controls as GMI). While the estimated mean differences and P values changed slightly, interpretations of the results remained the same.”
Quote in the paperNot a substantial claim - Interpretationreasoning
Wrist-worn devices may not accurately capture activity in individuals who rely on assistive devices, as arm movement is restricted.
“Such devices may not accurately capture activity in individuals who rely on assistive devices, as arm movement is restricted.”
Quote in the paperSubstantial claim
- May combine two claims. 57
- Classified as probably not a substantial claim. 30
May combine two claims.
PremisecitationPhysical activity attenuates cardiometabolic risk but does not eliminate the increased risk associated with high sedentary time.
“Emerging evidence suggests that physical activity attenuates cardiometabolic risk but does not eliminate the increased risk associated with high sedentary time [1,6].”
Quote in the paperSubstantial claim2 of 2 sources checked- cites [1] source
The Discussion reports that adjusting for moderate-to-vigorous physical activity attenuated the association between sedentary time and CVD risk, but the elevated risk remained significant in older women. This supports the persistence of risk with high sedentary time, but the study does not establish that physical activity itself reduces cardiometabolic risk more broadly. (LLM, conf=0.84)
Experimental — accuracy not yet measured - cites [6] source
The Findings and Interpretation passages (page not supplied) report that high physical activity seemed to eliminate the increased all-cause mortality risk associated with high sitting time—the opposite of the claim's unqualified statement. The paper distinguishes TV-viewing time, for which activity attenuated but did not eliminate increased mortality risk; it does not establish the stated cardiometabolic-risk outcome. (LLM, conf=0.88)
Checked by a reasoning model — may be wrong.
Experimental — accuracy not yet measured
May combine two claims.
PremisecitationSedentary behavior involves a lack of leg muscle contractions and restricted blood flow behind the knee when sitting, which causes reduced insulin sensitivity, vascular dysfunction, activation of low-grade inflammatory responses, and an imbalance in energy expenditure.
“It involves a lack of leg muscle contractions and restricted blood flow behind the knee when sitting, which causes reduced insulin sensitivity, vascular dysfunction, activation of low-grade inflammatory responses, and an imbalance in energy expenditure [3].”
Quote in the paperSubstantial claim1 of 1 sources checked- cites [3] source
Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.
Experimental — accuracy not yet measured
May combine two claims.
PremisecitationThe reason for prolonged sedentary time among these individuals may relate to fear of moderate-to-vigorous physical activity due to their heart condition among those with CVD or the perceived development of hypoglycemia among those with diabetes.
“The reason for this prolonged sedentary time among these individuals may relate to fear of moderate-to-vigorous levels of physical activity due to their heart condition among those with CVD or the perceived development of hypoglycemia among those with diabetes [10,11].”
Quote in the paperSubstantial claim1 of 2 sources checkedProbably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductcitationDepressive symptoms were measured using the Patient Health Questionnaire-9.
“Depressive symptoms were measured using the Patient Health Questionnaire-9 (PHQ-9) [37].”
Quote in the paperNot a substantial claim1 of 1 sources checked- cites [37] source
Classified as probably not a substantial claim.
Study design and conductcitationActivPAL3 data were used for analysis if the participant wore the device for more than 10 hours on a given day, at least 3 days.
“ActivPAL3 data were used for analysis if the participant wore the device for more than 10 hours on a given day, at least 3 days [30].”
Quote in the paperSubstantial claim1 of 1 sources checked- cites [30] source
The Data processing section (“What constitutes a valid day?”; page unavailable) reports that some studies used a minimum of 10 hours of wear to define a valid day. It does not establish at least three such days as a requirement for including a participant’s activPAL3 data in analysis; the wear-period section instead says the number of days depends on the study and recommends a protocol of at least seven days. (LLM, conf=0.87)
Experimental — accuracy not yet measured
May combine two claims.
PremisecitationFrequent standing or walking can reduce total sedentary time and disrupt prolonged sitting, changing physiological pathways and improving cardiometabolic outcomes.
“Frequent standing or walking can reduce total sedentary time and disrupt prolonged sitting, changing physiological pathways and improving cardiometabolic outcomes [12-14].”
Quote in the paperSubstantial claim3 of 3 sources checked- cites [12] source
The Discussion (page not available) reports that light-intensity activity breaks improve acute glycemic control, supporting the walking-related part of the claim. It also says standing breaks generally did not improve cardiometabolic markers and that the studies could not determine whether benefits came from less total sitting, added activity, or the interruption itself. The proposed physiological mechanism is therefore not established by this paper. (LLM, conf=0.88)
Experimental — accuracy not yet measured - cites [13] source
- cites [14] source
The Abstract reports that frequent two-minute walking breaks during prolonged sitting reduced postprandial glucose and insulin in overweight or obese adults. The Conclusions discuss a possible metabolic mechanism, but say whether brief standing alone protects metabolic health remains undetermined; the study did not establish a change in physiological pathways or broader cardiometabolic outcomes. Page numbers were not supplied in our copy. (LLM, conf=0.88)
Experimental — accuracy not yet measured
Classified as probably not a substantial claim. May combine two claims.
Study design and conductcitationData for analysis were extracted using PAL analysis with the validated CREA algorithm, which closely matches diary data in classifying wake time activities.
“Data for analysis were extracted from the device using PAL analysis (activPAL, version 8.11) with the validated CREA algorithm, which closely matches diary data in classifying wake time activities [31].”
Quote in the paperSubstantial claim1 of 1 sources checked- cites [31] source
May combine two claims.
PremisecitationReducing sedentary time with frequent breaks is safe in other chronic health conditions and applicable to patients with cardiometabolic diseases.
“Others have shown that reducing sedentary time with frequent breaks is safe in other chronic health conditions and applicable to patients with cardiometabolic diseases [15-17].”
Quote in the paperSubstantial claim1 of 3 sources checked- cites [15] source
- cites [16] source
- cites [17] source
The Results report no adverse events in the ACTIVATE Trial, and the results table reports reduced total and prolonged sitting time. However, the trial studied breast cancer survivors, not patients with cardiometabolic diseases, and it did not establish that frequent breaks were safe or effective in that population. (LLM, conf=0.86)
Experimental — accuracy not yet measured
May combine two claims.
PremisecitationExperimental studies confirm that sedentary breaks can improve glucose levels by 2% to 17% and fasting insulin levels by 15%.
“Experimental studies confirm that sedentary breaks can improve glucose levels by 2% to 17% and fasting insulin levels by 15% [12,14].”
Quote in the paperSubstantial claim2 of 2 sources checked- cites [12] source
The experimental-results sections report significant reductions in postprandial glucose response with activity breaks (about 1.4% and 17.4%) and a roughly 15% reduction in insulin with light-activity breaks. They do not identify that insulin result as a reduction in fasting insulin; the Discussion also cautions that the studies cannot establish whether the benefit comes from breaking up sitting rather than adding activity. Standing breaks did not significantly reduce glucose. (LLM, conf=0.87)
Experimental — accuracy not yet measured - cites [14] source
The Results (page not provided) show that activity breaks reduced postprandial glucose and insulin responses in overweight/obese adults. They report glucose reductions of 24.1%–29.6% and an insulin reduction of 23%, not the cited 2%–17% and 15%; the insulin result concerns the response after a test drink, not fasting insulin. (LLM, conf=0.91)
Experimental — accuracy not yet measured
Probably not a substantial claim: may not pass S3 (load-bearing).
InterpretationcitationOne possible explanation for the psychological outcomes is that participants in the Sit Less group may have become more aware of the challenges of replacing sedentary behavior with moderate levels of physical activity (response shift).
“One possible explanation is that participants in the Sit Less group may have become more aware of the challenges of replacing sedentary behavior with moderate levels of physical activity, a phenomenon known as response shift, which is commonly observed in self-reported outcomes in behavioral interventions [42].”
Quote in the paperNot a substantial claim1 of 1 sources checked- cites [42] source
The Background (page not provided) defines response shift as a change in how a person evaluates their own quality of life, and the Results report that many reviewed studies detected it. The paper does not establish that becoming more aware of the difficulty of replacing sedentary behavior is itself a response shift, or that response shift is common specifically in behavioral interventions. (LLM, conf=0.84)
Experimental — accuracy not yet measured
May combine two claims.
Findingown dataSit Less participants showed greater reductions in total sedentary time than control (adjusted mean difference −17.3 min/d, 95% CI −63 to 28; P=.45), not statistically significant.
“Sit Less participants showed greater reductions in total sedentary time (adjusted mean difference −17.3 min/d, 95% CI −63 to 28; P=.45)”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Findingown dataBaseline sedentary time among completers was approximately 10.4 hours per day.
“their baseline sedentary time was approximately 10.4 hours per day.”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataOther cardiometabolic biomarkers, physical activity, and psychological outcomes were not significantly different between groups.
“Other cardiometabolic biomarkers, physical activity, and psychological outcomes were not significantly different”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataSit Less participants showed increases in sit-to-stand transitions compared with control (4.2 per day, 95% CI −2 to 10; P=.13), not statistically significant.
“increases in sit-to-stand transitions (4.2 per day, 95% CI −2 to 10; P=.13)”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataSit Less participants showed greater reductions in prolonged sedentary time >60 min than control (−49.9 min/d, 95% CI −102 to 2; P=.06), not statistically significant.
“>60 minutes (−49.9 min/d, 95% CI −102 to 2; P=.06)”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataTime in range was higher in Sit Less than control (2.1%, 95% CI −4.8 to 9.1; P=.54), not statistically significant.
“time in range (2.1%, 95% CI −4.8 to 9.1; P=.54)”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataMean glucose was lower in Sit Less than control (−6.0 mg/dL, 95% CI −14.9 to 2.8; P=.18), not statistically significant.
“mean glucose (−6.0 mg/dL, 95% CI −14.9 to 2.8; P=.18)”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataSit Less participants showed greater reductions in prolonged sedentary time >30 min than control (−39.5 min/d, 95% CI −100 to 21; P=.20), not statistically significant.
“prolonged sedentary time of >30 minutes (−39.5 min/d, 95% CI −100 to 21; P=.20)”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataUntil week 9, participants responded to goal-setting messages at rates ranging from 91% to 83%, but in the last 3 weeks response rates decreased to 58%-66%.
“Until week 9, participants consistently responded to goal-setting messages, with adherence rates ranging from 91% to 83%. However, in the last 3 weeks of the program, response rates decreased, ranging between 58% and 66%.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
Findingown dataOf the 37 randomized participants, 19 (51%) were assigned to Sit Less and 18 (49%) to control.
“Of the 37 randomized participants, 19 (51%) were randomly assigned to the Sit Less group, and 18 (49%) were assigned to the control group.”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataOf 156 contacted, 128 (80%) met inclusion criteria, and 37 (30%) completed baseline assessments and were randomized.
“Of 156 participants who were contacted and assessed for eligibility, 128 (80%) met inclusion criteria, and of those, 37 (30%) completed all baseline assessments and were randomized (Figure 2).”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataAdherence to Fitbit wear peaked at weeks 5 and 7 with 96% wearing the device, and dropped to 76% at week 12.
“Adherence to Fitbit wear peaked at weeks 5 and 7, with 96% wearing the device, and was maintained throughout the study period, except for week 12, when adherence dropped to 76%.”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataThe Sit Less intervention showed consistent directional improvements compared with the control group, although between-group differences were not statistically significant.
“Overall, the Sit Less intervention showed consistent directional improvements compared with the control group, although between-group differences were not statistically significant.”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataBy targeting prolonged sedentary time, the program has shown a trend to decrease in total sitting time, increase in sedentary breaks, and possible improvements in glycemic outcomes.
“By targeting prolonged sedentary time, the program has shown a trend to decrease in total sitting time, increase in sedentary breaks, and possible improvements in glycemic outcomes.”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataSelf-efficacy for increasing physical activity increased in the control group but decreased in the Sit Less group, with a significant between-group difference observed for moderate activity (adjusted mean difference −0.6, 95% CI −1.1 to −0.2; P=.003).
“Self-efficacy for increasing physical activity increased in the control group but decreased in the Sit Less group, with a significant between-group difference observed for moderate activity (adjusted mean difference −0.6, 95% CI −1.1 to −0.2; P=.003; Table 5).”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataSit-to-stand transitions were unchanged in the control group (36.2, SD 13.7 vs 36.8, SD 12.0) but increased in the Sit Less group (43.7, SD 9.9 vs 46.6, SD 8.9), with a nonsignificant adjusted mean difference of 4.2 transitions per day (95% CI −2 to 10; P=.13).
“Sit-to-stand transitions were unchanged in the control group (36.2, SD 13.7 vs 36.8, SD 12.0) but increased in the Sit Less group (43.7, SD 9.9 vs 46.6, SD 8.9), with a nonsignificant adjusted mean difference of 4.2 transitions per day (95% CI −2 to 10; P=.13).”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataFor sedentary bouts of >60 minutes, the control group showed minimal change (1.9 min/d; 95% CI −47 to 44), whereas the Sit Less group decreased by 52.0 minutes per day (95% CI −111 to 4), with an adjusted difference of −49.9 minutes per day (95% CI −102 to 2; P=.06).
“For sedentary bouts of >60 minutes, the control group showed minimal change (1.9 min/d; 95% CI −47 to 44), whereas the Sit Less group decreased by 52.0 minutes per day (95% CI −111 to 4), with an adjusted difference of −49.9 minutes per day (95% CI −102 to 2; P=.06).”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataFor standing time, the control group decreased from 170.5 (IQR 99‐255) to 158.1 (IQR 115‐256) minutes per day, whereas the Sit Less group increased from 182.9 (IQR 144‐228) to 193.4 (IQR 144‐239). The adjusted between-group difference was 9.7 minutes per day (95% CI −52 to 71; P=.76), but it was not significant.
“For standing time, the control group decreased from 170.5 (IQR 99‐255) to 158.1 (IQR 115‐256) minutes per day, whereas the Sit Less group increased from 182.9 (IQR 144‐228) to 193.4 (IQR 144‐239). The adjusted between-group difference was 9.7 minutes per day (95% CI −52 to 71; P=.76), but it was not significant.”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataAlthough not statistically significant, participants in the Sit Less group increased both standing and stepping time by approximately 10 minutes more than those in the control group, despite variability in change scores.
“Although not statistically significant, participants in the Sit Less group increased both standing and stepping time by approximately 10 minutes more than those in the control group, despite variability in change scores.”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataAlthough not statistically significant, CGM outcomes were directionally consistent with HbA1c. Adjusted mean differences indicated lower glucose management index (−0.1%, 95% CI −0.4 to 0.1; P=.16) and average glucose level (−6.0 mg/dL, 95% CI −14.9 to 2.8; P=.18) in the Sit Less group compared with the control group at postintervention.
“Although not statistically significant, CGM outcomes were directionally consistent with HbA1c. Adjusted mean differences indicated lower glucose management index (−0.1%, 95% CI −0.4 to 0.1; P=.16) and average glucose level (−6.0 mg/dL, 95% CI −14.9 to 2.8; P=.18) in the Sit Less group compared with the control group at postintervention (Table 4).”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataThe intervention demonstrated high feasibility, acceptability, and adherence within the patient with cardiometabolic diseases groups over a 12-week period, characterized by high engagement with text messaging and consistent use of Fitbits.
“The intervention demonstrated high feasibility, acceptability, and adherence within the patient with cardiometabolic diseases groups over a 12-week period, characterized by high engagement with text messaging and consistent use of Fitbits.”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataTime spent in sedentary bouts of >30 minutes increased in the control group and decreased in the Sit Less group, with a nonsignificant adjusted between-group difference of −39.5 minutes per day (95% CI −100 to 21; P=.20).
“Time spent in sedentary bouts of >30 minutes increased in the control group and decreased in the Sit Less group (Table 2), with a nonsignificant adjusted between-group difference of −39.5 minutes per day (95% CI −100 to 21; P=.20).”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataFor stepping time, baseline values differed between groups (control: median 49.7 min/d, IQR 37‐75; Sit Less: median 80.8 min/d, IQR 52‐108; P=.01). Following the intervention, the control group and the Sit Less group both increased stepping time, but there was no statistically significant between-group difference following the intervention (adjusted mean difference 9.6 min/d, 95% CI −15 to 34; P=.
“For stepping time, baseline values differed between groups (control: median 49.7 min/d, IQR 37‐75; Sit Less: median 80.8 min/d, IQR 52‐108; P=.01). Following the intervention, the control group and the Sit Less group both increased stepping time, but there was no statistically significant between-group difference following the intervention (adjusted mean difference 9.6 min/d, 95% CI −15 to 34; P=.”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataStep counts also increased in both groups; however, there was no statistically significant between-group difference following the intervention (adjusted mean difference 711.4 steps per day, 95% CI −983 to 2406; P=.41).
“Step counts also increased in both groups; however, there was no statistically significant between-group difference following the intervention (adjusted mean difference 711.4 steps per day, 95% CI −983 to 2406; P=.41).”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataHbA1c levels were significantly lower in the Sit Less group compared with the control group at postintervention (adjusted mean difference −0.4%, 95% CI −0.8 to −0.1; P=.04), with a decrease observed in the Sit Less group (median change −0.4%, 95% CI −0.6 to −0.2) and minimal change in the control group (median change 0.1%, 95% CI −0.1 to 0.5).
“HbA1c levels were significantly lower in the Sit Less group compared with the control group at postintervention (adjusted mean difference −0.4%, 95% CI −0.8 to −0.1; P=.04), with a decrease observed in the Sit Less group (median change −0.4%, 95% CI −0.6 to −0.2) and minimal change in the control group (median change 0.1%, 95% CI −0.1 to 0.5).”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataNo statistically significant between-group differences were observed for other cardiometabolic outcomes, including weight, BMI, waist circumference, insulin, or blood pressure. Total cholesterol and low-density lipoprotein decreased and high-density lipoprotein increased, whereas triglycerides increased; however, none of these adjusted between-group differences were statistically significant.
“No statistically significant between-group differences were observed for other cardiometabolic outcomes, including weight, BMI, waist circumference, insulin, or blood pressure. Total cholesterol and low-density lipoprotein decreased and high-density lipoprotein increased, whereas triglycerides increased; however, none of these adjusted between-group differences were statistically significant (Mult”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S2 (checkable).
InterpretationreasoningThese findings support evaluation in larger, adequately powered trials.
“these findings support evaluation in larger, adequately powered trials.”
Quote in the paperNot a substantial claimClassified as probably not a substantial claim.
Study design and conductnone givenGeneralized linear models estimated adjusted between-group differences, controlling for baseline values, cohort, cohort×group interaction, and leisure-time exercise.
“Generalized linear models estimated adjusted between-group differences, controlling for baseline values, cohort, cohort×group interaction, and leisure-time exercise.”
Quote in the paperSubstantial claimMay combine two claims.
PremisecitationGreater total sedentary time is related to increased cardiometabolic risk, including decreased high-density lipoprotein levels and increased triglycerides, fasting glucose, BMI, and waist circumference.
“greater total sedentary time is related to increased cardiometabolic risk [2], including decreased high-density lipoprotein levels and increased triglycerides, fasting glucose [4], BMI, and waist circumference [5].”
Quote in the paperSubstantial claim0 of 3 sources checkedClassified as probably not a substantial claim.
Study design and conductnone givenParticipants with cardiovascular disease or type 2 diabetes underwent separate randomization into the Sit Less intervention or the control group.
“Participants with cardiovascular disease or type 2 diabetes underwent separate randomization into the Sit Less intervention or the control group.”
Quote in the paperSubstantial claimMay combine two claims.
Interpretationown dataThe Sit Less intervention was feasible and acceptable and showed possible improvements in sedentary behavior and glycemic outcomes.
“The Sit Less intervention was feasible and acceptable and showed possible improvements in sedentary behavior and glycemic outcomes.”
Quote in the paperSubstantial claimClassified as probably not a substantial claim. May combine two claims.
Study design and conductnone givenThis pilot study was designed to assess feasibility and acceptability rather than to conduct a fully powered hypothesis test.
“This pilot study was designed to assess the feasibility and acceptability of the Sit Less program rather than to conduct a fully powered hypothesis test.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductcitationThe Self-Report Habit Index measure has previously reported Cronbach α=0.91, 0.82, and 0.83.
“Habit strength for sedentary behavior was assessed using the validated Self-Report Habit Index measure (previously reported Cronbach α=0.91, 0.82, and 0.83) [36].”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [36] source
Probably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductnone givenThe study was conducted in accordance with the CONSORT guidelines.
“The study was conducted in accordance with the CONSORT (Consolidated Standards of Reporting Trials) guidelines (Checklist 1).”
Quote in the paperNot a substantial claimMay combine two claims.
Study design and conductown dataNo significant between-group differences were found in nonwear time and baseline activities except for stepping time.
“No significant between-group differences were found in nonwear time and baseline activities except for stepping time.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
Study design and conductnone givenAll analyses were conducted using an intention-to-treat approach without data imputation.
“All analyses were conducted using an intention-to-treat approach without data imputation.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductown dataAnother Sit Less participant withdrew during the intervention due to a Fitbit data recording error.
“Another Sit Less group participant withdrew during the intervention due to a Fitbit data recording error.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
Study design and conductcitationDried blood spot testing has shown a strong correlation with conventional serum tests, making it a reliable and convenient tool for screening for cardiometabolic risk factors.
“Dried blood spot testing has shown a strong correlation with conventional serum tests, making it a reliable and convenient tool for screening for cardiometabolic risk factors [33,34].”
Quote in the paperNot a substantial claim0 of 2 sources checkedClassified as probably not a substantial claim. May combine two claims.
Study design and conductown dataRandomization occurred within each disease group, and a 1:1 randomization list was created by a statistician and uploaded into the REDCap randomization module.
“Randomization occurred within each disease group. A 1:1 randomization list was created by a statistician and uploaded into the REDCap randomization module.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductcitationThe Self-Efficacy Questionnaire for Physical Activity and Sedentary Behavior has previously reported Cronbach α=0.79 and 0.85.
“The Self-Efficacy Questionnaire for Physical Activity and Sedentary Behavior (previously reported Cronbach α=0.79 and 0.85) [35].”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites [35] AdamsMMOn our feet: feasibility trial of an intervention to reduce sedentary behavior and increase physical activity2012The University of North Carolina at Greensboro
Couldn’t be matched to a paper in Crossref, so it can’t be checked.
Probably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductreasoningExtreme outlier biomarker values were winsorized by replacing them with the next highest observed value.
“Given the small sample size, extreme values were winsorized by replacing them with the next highest observed value.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductown dataSensitivity analyses using transformed variables and the Gaussian distribution produced similar findings to the Gamma log link models.
“We also conducted the same analyses using transformed variables and the Gaussian distribution, with similar findings resulting from the models using the Gamma, log link function”
Quote in the paperNot a substantial claimClassified as probably not a substantial claim.
Study design and conductreasoningBetween-group models included baseline outcome value, cohort, cohort×group interaction, and leisure-time exercise as covariates.
“Each model included the corresponding baseline value of the outcome, cohort (CVD vs T2D), and the interaction between study group and cohort. Baseline outcome values were included to account for baseline variability, while the cohort and the cohort×group interaction term were included to account for known differences in cardiometabolic responses between the 2 clinical cohorts and to assess whether”
Quote in the paperSubstantial claimMay combine two claims.
Study design and conductcitationThe activPAL3 accurately detects sitting and standing postures and has been validated against direct observation.
“The activPAL3, worn on the thigh, accurately detects sitting and standing postures and has been validated against direct observation [29].”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [29] source
Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
Study design and conductown dataBoth groups wore the activPAL continuously with minimal nonwear time.
“Both the Sit Less and control groups wore the activPAL continuously (24 h/d), with minimal nonwear time (median 0 min/d, IQR 0‐0).”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
Study design and conductown dataBoth studies were approved by the Vanderbilt Institutional Review Board and registered on ClinicalTrials.gov.
“Both studies were approved by the Vanderbilt Institutional Review Board and registered on ClinicalTrials.gov (CVD cohort: NCT05534256, August 24, 2022; T2D cohort: NCT05691452, January 5, 2023).”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductreasoningParticipants and the interventionist were not blinded to the allocation.
“Participants and the interventionist were not blinded to the allocation due to the nature of the intervention program.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
Study design and conductnone givenOutcome assessors and data analysts were blinded to the allocation.
“However, outcome assessors and data analysts were blinded to the allocation.”
Quote in the paperNot a substantial claimMay combine two claims.
InterpretationcitationThe observed reductions in the Sit Less group may have clinical relevance for individuals with diabetes and/or CVD, considering that reducing and replacing 30 minutes of sedentary time yields significant cardiometabolic benefits and reduces the risk of developing CVD and mortality.
“Considering that reducing and replacing 30 minutes of sedentary time yields significant cardiometabolic benefits and reduces the risk of developing CVD and mortality [21], the observed reductions in the Sit Less group may have clinical relevance for individuals with diabetes and/or CVD.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites [21] source
May combine two claims.
Interpretationown dataIts multitechnology was well received by older adults, reinforcing its suitability for patients with cardiometabolic diseases.
“Its multitechnology was well received by older adults, reinforcing its suitability for patients with cardiometabolic diseases.”
Quote in the paperSubstantial claimClassified as probably not a substantial claim.
Study design and conductreasoningThe significant finding for HbA1c should be interpreted with caution in light of the limited sample size and potential model instability.
“Accordingly, the significant finding for HbA1c should be interpreted with caution in light of the limited sample size and potential model instability.”
Quote in the paperSubstantial claimMay combine two claims.
PremisecitationFrequent, short breaks (walking 5 min for every hour sitting) are practical, low-burden alternatives to exercise, proven to improve glucose and insulin levels.
“Frequent, short breaks (walking 5 min for every hour sitting) are practical, low-burden alternatives to exercise, proven to improve glucose and insulin levels [7,39].”
Quote in the paperSubstantial claim0 of 2 sources checkedProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
InterpretationreasoningIt is also possible that the measures used were not sufficiently sensitive to detect short-term changes in psychological constructs such as habit formation or that the pilot sample size was underpowered to detect modest psychological effects.
“However, it is also possible that the measures used were not sufficiently sensitive to detect short-term changes in psychological constructs such as habit formation or that the pilot sample size was underpowered to detect modest psychological effects.”
Quote in the paperNot a substantial claimClassified as probably not a substantial claim.
Study design and conductreasoningGiven the pilot nature of the study, small sample size, and multiple outcomes examined, the HbA1c finding should be interpreted cautiously.
“However, given the pilot nature of the study, small sample size, and multiple outcomes examined, the HbA1c finding should be interpreted cautiously.”
Quote in the paperSubstantial claimMay combine two claims.
Study design and conductown dataThe study was underpowered to detect intervention effects on outcomes, and CIs are wide.
“In this randomized controlled pilot trial, we were underpowered to detect intervention effects on outcomes, and CIs are wide; however, we still detected some directional changes in outcomes of interest in the Sit Less group relative to the control group.”
- Also stated in: § Limitations · plain
“The study was not powered to formally test hypotheses regarding intervention efficacy, and CIs were wide.”
Quote in the paperSubstantial claim- Also stated in: § Limitations · plain
Probably not a substantial claim: may not pass S3 (load-bearing).
Study design and conductreasoningTo maintain model parsimony and reduce the risk of overfitting, no additional exploratory covariates were included in the final models beyond those considered clinically or methodologically essential.
“To maintain model parsimony and reduce the risk of overfitting, no additional exploratory covariates were included in the final models beyond those considered clinically or methodologically essential.”
Quote in the paperNot a substantial claimMay combine two claims.
Interpretationown dataOur findings suggest that the intervention was feasible for targeting prolonged sedentary time and provide preliminary suggestions for further investigation in adequately powered trials.
“Our findings suggest that the intervention was feasible for targeting prolonged sedentary time and provide preliminary suggestions for further investigation in adequately powered trials.”
Quote in the paperSubstantial claimMay combine two claims.
Study design and conductown dataParticipants were recruited from a single hospital in Nashville, USA, and were predominantly White and highly educated, which limits generalizability.
“For instance, participants were recruited from a single hospital in Nashville, USA, and were predominantly White and highly educated. Although feasibility and acceptability were high in this sample, challenges such as varying comfort with technology and device usability may be more pronounced in other populations.”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S4 (based). May combine two claims.
InterpretationreasoningThe Sit Less program achieved these outcomes by integrating simple standing and walking breaks into daily routines, effectively overcoming common exercise barriers such as fear of hypoglycemia, cardiac discomfort, and time constraints.
“The Sit Less program achieved these outcomes by integrating simple standing and walking breaks into daily routines, effectively overcoming common exercise barriers such as fear of hypoglycemia, cardiac discomfort, and time constraints.”
Quote in the paperNot a substantial claimMay combine two claims.
PremisecitationIntervention studies on sedentary breaks in T2D or CVD are limited and mostly short-term laboratory studies.
“However, intervention studies on sedentary breaks in T2D or CVD are limited and mostly short-term laboratory studies [7,39].”
Quote in the paperSubstantial claim0 of 2 sources checkedMay combine two claims.
Study design and conductown dataBaseline HbA1c levels (median, approximately 5.0%‐5.5%) were within the nondiabetic or well-controlled range for many participants, and no participants had baseline HbA1c levels >7.0%, further limiting generalizability.
“Moreover, baseline HbA1c levels (median, approximately 5.0%‐5.5%) were within the nondiabetic or well-controlled range for many participants, and no participants had baseline HbA1c levels >7.0%, further limiting generalizability.”
Quote in the paperSubstantial claimMay combine two claims.
Interpretationown dataThe Sit Less intervention effectively integrated multiple technologies to reduce sedentary behavior in patients with cardiometabolic diseases.
“In conclusion, the Sit Less intervention effectively integrated multiple technologies to reduce sedentary behavior in patients with cardiometabolic diseases.”
Quote in the paperSubstantial claimMay combine two claims.
InterpretationreasoningThe positive outcomes were observed in a participant group with a median age of 67 years, indicating the potential of the multitechnology-based Sit Less program to reduce sedentary time and foster more active lifestyles among older adults with cardiometabolic conditions.
“Notably, these positive outcomes were observed in a participant group with a median age of 67 years, indicating the potential of our multitechnology-based Sit Less program to reduce sedentary time and foster more active lifestyles among older adults with cardiometabolic conditions.”
Quote in the paperSubstantial claimMay combine two claims.
Interpretationown dataOur approach, which minimizes typical exercise barriers and promotes short active breaks, has demonstrated high feasibility and acceptance, suggesting its promise for future large-scale interventions.
“Our approach, which minimizes typical exercise barriers and promotes short active breaks, has demonstrated high feasibility and acceptance, suggesting its promise for future large-scale interventions.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
Study design and conductown dataParticipants wore the CGM device for a median of 9 days in both groups, with no between-group differences.
“Participants wore the CGM device for a median of 9 days in both groups, with no between-group differences.”
Quote in the paperNot a substantial claim
The paper relies on this without support.
Mobile technologies, including activity trackers and smart water bottles, offer a low-cost and sustainable approach to reducing sedentary behavior.
“Mobile technologies, including activity trackers (ie, Fitbit) and smart water bottles, offer a low-cost and sustainable approach to reducing sedentary behavior.”
The paper relies on this without support.
Wearable technologies may be a promising strategy to reduce total sedentary time and disrupt prolonged sitting patterns through features such as self-monitoring and prompts.
“The use of wearable technologies may be a promising strategy to reduce total sedentary time and disrupt prolonged sitting patterns through features such as self-monitoring and prompts.”
The paper relies on this without support.
Smart water bottles can naturally break sedentary time by encouraging increased water intake, resulting in more frequent trips to the kitchen and restroom.
“In addition, the use of a smart water bottle can naturally break sedentary time by encouraging increased water intake, resulting in more frequent trips to the kitchen and restroom.”
The paper relies on this without support.
No wearable technology–based sedentary behavior reduction programs focusing on sedentary breaks for patients with cardiometabolic diseases are available.
“To date, no wearable technology–based sedentary behavior reduction programs focusing on sedentary breaks for patients with cardiometabolic diseases are available.”
The paper relies on this without support.
This is the first study integrating Fitbit devices and smart water bottle technologies and algorithm-driven text messages to encourage frequent sedentary breaks.
“This is the first study integrating Fitbit devices and smart water bottle technologies and algorithm-driven text messages to encourage frequent sedentary breaks.”
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
Eligibility percentage does not match the counts
MinorOf 156 people assessed, 128 is 82.1%, not the reported 80%.
Reported 80 · recomputed 82.051282
“Of 156 participants who were contacted and assessed for eligibility, 128 (80%) met inclusion criteria”
Percentage of men uses a different denominator
MinorThe abstract says 21 of the 35 participants who completed the study were men. That is 60%, not 62%; 62% corresponds to 21 of the 34 participants with gender reported in Table 1.
Reported 62 · recomputed 60
“Of the 35 participants who completed the study, 62% (n=21) were men”
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“The 12-week Sit Less program was developed based on a Habit Formation framework [20] to target sedentary behavior.”
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- Authors
- Park, C., Dietrich, M. S., Larsen, B., Mayberry, L. S., Doyle, A., Ahn, S., Jean, J., Maquiling, K., Mogos, M. F., Muchira, J. M., & Mulvaney, S.
- Affiliations
- Seoul National University (KR)
- Vanderbilt University (US)
- University of California San Diego (US)
- Boston College (US)
- Vanderbilt University Medical Center (US)
- ORCID
- Venue
- JMIR mHealth and uHealth
- Publisher
- JMIR Publications Inc.
- Published
- 2026-08-25
- Volume
- 14
- Pages
- e56497
- ISSN
- 2291-5222 (ISSN-L)
- PMC
- PMC13505886
- OpenAlex
- W7165960487
- Cited by
- 0
- References
- 41
- FWCI
- 0.00
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- cc-by
- Locations
- JMIR mhealth and uhealth (publishedVersion, cc-by)
- PubMed (publishedVersion)
- PubMed Central (submittedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Funders
- Gordon and Betty Moore Foundation
- Vanderbilt University
- Seoul National University
- National Institutes of Health
- National Institute of Diabetes and Digestive and Kidney Diseases
- Topics
- Health Sciences › Medicine › Physiology › Physical Activity and Health
- Health Sciences › Health Professions › General Health Professions › Mobile Health and mHealth Applications
- Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Context-Aware Activity Recognition Systems
- Keywords
- sedentary behavior, Fitbit, text messaging intervention, cardiometabolic disease, coronary artery disease, type 2 diabetes, sit-to-stand, physical activity, continuous glucose monitoring, HbA1c, cardiovascular risk, wearable activity trackers, intervention feasibility and acceptability, sedentary time reduction, cardiometabolic biomarkers, psychological factors, self-monitoring
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-09.
Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-09.
Cited sources are checked by gpt-6-sol.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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