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Sleep as an Effect Modifier for Physical Activity Intervention Efficacy: Secondary Analysis of Data from Two
Tayla von Ash1, Shira Dunsiger2, Belinda O'Hagan2
1Department of Behavioral and Social Sciences, Brown University School of Public Health, Providence, United States. tayla_ash@brown.edu.
International Journal of Behavioral Medicine
|July 20, 2026
Summary
Sufficient sleep duration may enhance the effectiveness of physical activity (PA) interventions for Latinas. Women with more time in bed experienced greater benefits from PA programs, highlighting sleep
Area of Science:
- Public Health
- Behavioral Science
- Sleep Medicine
Background:
- Physical activity (PA) is crucial for health, yet Latinas face high inactivity rates and related health burdens.
- Understanding factors influencing PA intervention success in Latinas is essential.
- The role of sleep in moderating PA intervention efficacy remains under-researched.
Purpose of the Study:
- To investigate time in bed (as a proxy for sleep duration) as a moderator of PA intervention effects.
- To analyze intervention impacts on PA outcomes in sedentary Latinas across two randomized controlled trials.
Main Methods:
- Utilized generalized mixed effects models with subject-specific intercepts.
- Analyzed data from two distinct randomized controlled trials to ensure consistent findings.
Main Results:
- Time in bed significantly moderated intervention effects on PA outcomes over time (p < 0.05).
- Participants with more time in bed showed greater PA improvements from interventions compared to control or original interventions.
Conclusions:
- This study is the first to identify a sleep-related measure as an effect modifier for PA intervention success.
- Adequate sleep duration may be crucial for maximizing the benefits of PA interventions among Latinas.
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