Cited by 118Mobile Health and mHealth ApplicationsPhysical Activity and HealthDigital Mental Health Interventions

Behavioral response to a just-in-time adaptive intervention (JITAI) to reduce sedentary behavior in obese adults: implications for JITAI optimization

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Thomas, J. Graham, Bond, Dale S.·2015·Health Psychology

Abstract

OBJECTIVE: Just-in-time adaptive interventions (JITAIs) use mobile computers, sensors, and software analytics to automatically detect behavior and deliver tailored treatment. However, little is known about how JITAIs influence patterns of behavior or how best to design JITAIs for maximum effect. METHOD: This study examined prompts and behavioral response to the B-MOBILE JITAI for reducing sedentary behavior (SB) in overweight/obese individuals. Thirty participants (83% women; 67% White, mean ± SD body mass index = 36.2 kg/m2) tested 3 conditions presented in a randomized counterbalanced order involving smartphone-based prompts for walking breaks of (a) 3 min after 30 SB min, (b) 6 min after 60 SB min, and (c) 12 min after 120 SB min. RESULTS: Participants carried the smartphone an average of 6.90 days during each 7-day condition, for an average of 14.94 hr per day. The 3- and 6-min conditions resulted in the greatest number of prompts, walking breaks, the best adherence to prompts, the greatest amount of daily time spent in walking breaks, and fastest adherence to prompts (ps < .01). Small but statistically significant decreases in the number of daily walking breaks, adherence to prompts, and minutes per day spent in walking breaks were observed as a function of the number of days spent in a condition (ps < .05). CONCLUSIONS: The B-MOBILE JITAI was effective in prompting breaks in sedentary behavior when it was most clinically relevant. Frequent prompts for small change may be an optimal strategy for shaping sedentary behavior, although more research is needed to determine how best to promote long-term adherence.

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  1. Nahum-Shani I Smith SN Tewari A Witkiewitz K Collins LM Spring B Murphy S Just in time adaptive interventions (jitais): An organizing framework for ongoing health behavior support Methodology Center technical report 2014 14 126 PMC5364076 27663578

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Authors
Thomas, J. G., & Bond, D. S.
Affiliations
Brown University (US)
Venue
Health Psychology
Published
2015-12
Volume
34
Issue
Suppl
Pages
1261-1267
ISSN
  • 0278-6133 (ISSN-L)
  • 1930-7810
OpenAlex
W2412754601
Cited by
117
References
27
Citations by year
2026: 8 · 2025: 6 · 2024: 13 · 2023: 7 · 2022: 21 · 2021: 13 · 2020: 11 · 2019: 14 · 2018: 12 · 2017: 6 · 2016: 5 · 2015: 1
FWCI
14.63
Type
journal article
Language
en
Open access
Locations
  • Health Psychology (publishedVersion, other-oa)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institutes of Health (R03 DK095740)
Topics
  • Health Sciences › Health Professions › General Health Professions › Mobile Health and mHealth Applications
  • Health Sciences › Medicine › Physiology › Physical Activity and Health
  • Social Sciences › Psychology › Applied Psychology › Digital Mental Health Interventions
Keywords
just-in-time adaptive interventions, sedentary behavior, obesity, overweight adults, walking breaks, intervention optimization, behavioral adherence, physical activity promotion
MeSH terms
Adaptation, Psychological, Adult, Aged, Female, Humans, Male, Middle Aged, Motor Activity, Obesity, Time Factors, Body Mass Index, Walking, Telemedicine, Cell Phone, Young Adult, Sedentary Behavior, Early Medical Intervention

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