Cited by 230Sleep and related disordersCircadian rhythm and melatoninSleep and Work-Related Fatigue

The DOI matches its Crossref record, with a small difference in title or year; 25 of the 27 references it cites were found in a registry or an index; none of the 31 sources its claims cite is checked for support yet.

Cross-Sectional Associations Between Measures of Sleep and Markers of Glucose Metabolism Among Subjects With and Without Diabetes

Open access
Knutson, Kristen L., Van Cauter, Eve, Zee, Phyllis, Liu, Kiang, Lauderdale, Diane S.·2011·Diabetes Care

Abstract

OBJECTIVE: To examine whether sleep duration and quality are associated with fasting glucose, fasting insulin, or estimated insulin resistance in a community-based sample of early middle-aged adults. RESEARCH DESIGN AND METHODS: This was an ancillary study to the Coronary Artery Risk Development in Young Adults (CARDIA) Study. Habitual sleep duration and fragmentation were estimated from 6 days of wrist actigraphy collected in 2003–2005. Insomnia was defined as self-reported difficulty falling asleep or waking up in the night three or more times per week plus average sleep efficiency of <80% based on actigraphy. Fasting blood samples to measure glucose and insulin were collected after the sleep measures during the CARDIA clinical examination in 2005–2006. Insulin resistance was estimated using the homeostatic model assessment (HOMA) method. Analyses were cross-sectional and stratified by the presence of diabetes. RESULTS: There was no association between sleep measures and fasting glucose, insulin, or HOMA in the 115 subjects without diabetes. Among the 40 subjects with diabetes, after adjustment for covariates, 10% higher sleep fragmentation was associated with a 9% higher fasting glucose level, a 30% higher fasting insulin level, and a 43% higher HOMA level. Insomnia was associated with a 23% higher fasting glucose level, a 48% higher fasting insulin level, and an 82% higher HOMA level. CONCLUSIONS: The observed association between poor sleep quality and higher glucose, insulin, and estimated insulin resistance among subjects with diabetes warrants further examination of the effect of sleep disturbances on glucose control in type 2 diabetes.

Overview

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Written from the paper’s full text.

TL;DR

In this cross-sectional CARDIA ancillary study, objectively measured sleep duration was not associated with fasting glucose, insulin, or HOMA-IR, but greater sleep fragmentation and insomnia were associated with worse glucose metabolism among participants with diabetes, not those without. The authors conclude that poor sleep quality may be clinically relevant for glycemic control in type 2 diabetes and warrants further study.

Key findings

  • Among the 40 subjects with diabetes, fully adjusted models showed that each 10% higher sleep fragmentation was associated with a 9% higher fasting glucose level, a 30% higher fasting insulin level, and a 43% higher HOMA level.
  • Insomnia among subjects with diabetes was associated with a 23% higher fasting glucose level, a 48% higher fasting insulin level, and an 82% higher HOMA level.
  • There was no association between sleep measures and fasting glucose, insulin, or HOMA in subjects without diabetes; the abstract states 115 subjects without diabetes, while Table 1 reports n=531 without diabetes and n=40 with diabetes (final sample 571). In unadjusted models among those without diabetes, frequent snoring and shorter sleep duration were associated with some outcomes, but these were not significant after adjustment; adjusted insomnia was associated with 14% lower fasting insulin and 14% lower HOMA.
  • Sleep duration was not associated with any outcome in either group, and frequent snoring was not significantly associated with outcomes in fully adjusted models.

Methods

  • Ancillary study to CARDIA at the Chicago site; 670 of 814 eligible participants consented, and the final analytic sample was 571 after excluding 9 with <3 days of actigraphy, 87 with reported fasting <8 h, 2 missing fasting glucose or insulin, and 1 with unknown diabetes status. Sleep was measured in 2003–2005 with wrist actigraphy (Actiwatch-16, 3 days on two occasions approximately 1 year apart) and questionnaires; fasting blood samples were collected in 2005–2006.
  • Diabetes was defined by fasting plasma glucose ≥6.99 mmol/L, self-reported diagnosis, or diabetes medication use. HOMA-IR was calculated as fasting insulin (mU/L) × fasting glucose (mmol/L)/22.5. Insomnia was defined as self-reported difficulty falling asleep or waking at night ≥3 times/week plus actigraphic sleep efficiency <80%; frequent snoring was based on the Berlin Sleep Apnea questionnaire.
  • Cross-sectional linear regressions were stratified by diabetes status; each sleep measure was entered into a separate model. Outcomes were natural-log transformed, and models were unadjusted and adjusted for age, race, sex, BMI, education, and income, using robust variance estimators.

Limitations

  • The paper states that the cross-sectional design cannot determine causal direction; there were no polysomnographic measures, so sleep disorders such as obstructive sleep apnea could not be accurately detected; fasting status was self-reported and not objectively verified; the diabetes subgroup included only 40 individuals; and sleep was not assessed immediately before the clinical examination.
  • Evident from the text: the small diabetes subgroup limits precision and generalizability, and multiple sleep predictors and outcomes were tested in separate models without stated adjustment for multiple comparisons.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.2337/dc10-1962

Cites

25 of 25 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Verification

Claims the paper makes

0 of 31 cited sources checked · 0 supported · 0 flagged

Show all 20 claims

  • It may state two separate claims as one. 25
  • Probably not a substantial claim. 12
31 of 31
  • The paper relies on this without support.

    Laboratory studies in healthy subjects have indicated that lower cerebral glucose utilization, elevated sympathetic activity, higher evening cortisol levels, alterations in growth hormone release, and elevated markers of inflammation are on the pathways that mediate the adverse effects of reduced sleep duration or quality on glucose metabolism, or both.

    “Laboratory studies in healthy subjects have indicated that lower cerebral glucose utilization, elevated sympathetic activity, higher evening cortisol levels, alterations in growth hormone release, and elevated markers of inflammation are on the pathways that mediate the adverse effects of reduced sleep duration or quality on glucose metabolism, or both.”
  • The paper relies on this without support.

    Several prospective studies found higher rates of incident diabetes associated with shorter sleep durations.

    “Several prospective studies found higher rates of incident diabetes associated with shorter sleep durations.”
  • The paper relies on this without support.

    Patients with type 2 diabetes are at a higher risk of diabetes complications if their glucose levels are poorly controlled.

    “Patients with type 2 diabetes are at a higher risk of diabetes complications if their glucose levels are poorly controlled.”
  • The paper relies on this without support.

    The mechanisms responsible for glucose homeostasis are already deficient in subjects with diabetes and therefore more vulnerable to additional perturbation.

    “because the mechanisms responsible for glucose homeostasis are already deficient and therefore more vulnerable.”
4 of 4

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

Each contradiction between two passages listed here was confirmed by an independent check.

  • Diabetes-group insomnia insulin confidence interval is inconsistent with its coefficient

    Major

    For the adjusted diabetes-group insomnia result, the reported confidence interval has a midpoint of 0.321, not the reported coefficient of 0.389. Its lower bound also crosses zero despite the reported P value of 0.019.

    Reported 0.389 · recomputed 0.321

  • Abstract says there were no associations in subjects without diabetes

    Major

    The abstract's blanket statement conflicts with the fully adjusted results for subjects without diabetes: insomnia was associated with lower insulin and HOMA, with P values of 0.030 and 0.038, respectively.

  • Abstract gives the wrong number of participants without diabetes

    Minor

    The abstract says there were 115 subjects without diabetes, but Table 1 lists 531. The table's 531 subjects without diabetes and 40 with diabetes also sum to the stated final sample of 571.

3 of 3

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Metadata

Authors
Knutson, K. L., Van Cauter, E., Zee, P., Liu, K., & Lauderdale, D. S.
Affiliations
  • University of Chicago (US)
  • Department of Medicine, University of Chicago, Chicago, Illinois
  • Northwestern University (US)
Corresponding author
Knutson, Kristen L.
Venue
Diabetes Care
Published
2011-04-20
Volume
34
Issue
5
Pages
1171-1176
ISSN
  • 0149-5992 (ISSN-L)
  • 1935-5548
OpenAlex
W1967340496
Cited by
230
References
27
Citations by year
2026: 6 · 2025: 12 · 2024: 8 · 2023: 11 · 2022: 18 · 2021: 9 · 2020: 12 · 2019: 13 · 2018: 13 · 2017: 19 · 2016: 20 · 2015: 22 · 2014: 16 · 2013: 25 · 2012: 21
FWCI
27.52
Type
journal article
Language
en
Open access
Locations
  • Diabetes Care (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (n01hc95095-66-0-1, n01hc48050-59-0-1, n01hc48048-58-0-1, n01hc48047-55-0-1, n01hc48049-61-0-1)
  • U.S. Public Health Service
  • National Institute on Aging (P01AG011412)
  • National Heart, Lung, and Blood Institute (N01HC48050, N01 HC 95095, N01 HC048048, N01-HC-048049, NO1-HC-48049, N01 HC095095, N01 HC048050, N01-HC48048, N01-HC-48-049, N01 HC048047, NO1-HC-95095, N01-HC-480-47)
Topics
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
Keywords
sleep duration, sleep quality, sleep fragmentation, insomnia, diabetes mellitus, insulin resistance, fasting blood glucose, fasting insulin, glucose metabolism, type 2 diabetes, middle-aged adults, actigraphy
MeSH terms
Adult, Blood Glucose, Cross-Sectional Studies, Diabetes Mellitus, Fasting, Female, Humans, Sleep Initiation and Maintenance Disorders, Insulin, Insulin Resistance, Male, Middle Aged, Sleep, Actigraphy

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