Table of Contents
ISRN Obesity
Volume 2012, Article ID 320157, 6 pages
Research Article

Time in Bed Is Associated with Decreased Physical Activity and Higher BMI in Women Seeking Weight Loss Treatment

1Weight Control and Diabetes Research Center, The Miriam Hospital and Department of Psychiatry and Human Behavior, Alpert Medical School of Brown University, 196 Richmond Street, Providence, RI 02903, USA
2Department of Urology, University of California, San Francisco and UCSF Women’s Health Clinic Research Center, 1635 Divisadero Street, Suite 600, San Francisco, CA 94143-1793, USA
3San Francisco Coordinating Center, University of California, San Francisco and California Pacific Medical Center Research Institute, Suite 5700, 185 Berry Street, San Francisco, CA 94107, USA
4Division of Biostatistics, Department of Epidemiology and Biostatistics, University of California, San Francisco, 185 Berry Street, Lobby 5, Suite 5700, San Francisco, CA 94107, USA

Received 11 October 2012; Accepted 30 October 2012

Academic Editors: E. K. Naderali and B. Navia

Copyright © 2012 Chantelle N. Hart et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Short sleep duration is associated with obesity risk. Despite calls to incorporate strategies to enhance sleep within the context of behavioral weight loss (BWL) treatment, little is known regarding the association between sleep and body mass index (BMI) among individuals presenting for BWL. Moreover, most research has focused on eating pathways linking sleep and BMI and has not explored how sleep may impact engagement in physical activity. The purpose of the present study was to determine whether, in a sample of women seeking treatment for weight loss, there was an association between reported time in bed (TIB), higher BMI, lower physical activity, and less favorable dietary composition. Prior to randomization, 318 women completed measures of TIB, eating, and activity; weight and height were measured. Findings demonstrated that report of “6 hours or less” TIB/night was associated with higher BMI and lower reported physical activity compared to that of the referent (>7 to ≤8 hours/night). It was not associated with the number of reported calories consumed each day or with the percent of calories consumed from fat, carbohydrates, or protein. Better understanding of the role of sleep within the context of BWL treatment in women seems warranted.