association between sleep duration and obesity in older adults

Background: Reduced sleep has been reported to predict obesity in children and young adults. However, studies based on self-report have been unable to identify an association in older populations. In this study, the cross-sectional associations between sleep duration measured objectively and measure...

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Published in:	International Journal of Obesity 2008-12, Vol.32 (12), p.1825-1834
Main Authors:	Patel, S.R, Blackwell, T, Redline, S, Ancoli-Israel, S, Cauley, J.A, Hillier, T.A, Lewis, C.E, Orwoll, E.S, Stefanick, M.L, Taylor, B.C, Yaffe, K, Stone, K.L
Format:	Article
Language:	eng
Subjects:	actigraphy Adiposity Age Factors Aged Aged, 80 and over Biological and medical sciences Body fat Body Mass Index Body Weight Cohort Studies Critical care Cross-Sectional Studies Disorders of higher nervous function. Focal brain diseases. Central vestibular syndrome and deafness. Brain stem syndromes elderly elderly nutrition Epidemiology Female gender differences Health aspects Humans Insomnia Male Measurement Medical sciences men Metabolic diseases Nervous system (semeiology, syndromes) Neurology Obesity Obesity - etiology Older people osteoporosis Polysomnography Preventive medicine Risk Factors Sleep Sleep - physiology Sleep apnea Sleep Apnea Syndromes - complications Sleep disorders Sleep Initiation and Maintenance Disorders - complications Time Factors United States Waist Circumference women Womens health Young adults
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Summary:	Background: Reduced sleep has been reported to predict obesity in children and young adults. However, studies based on self-report have been unable to identify an association in older populations. In this study, the cross-sectional associations between sleep duration measured objectively and measures of weight and body composition were assessed in two cohorts of older adults. Methods: Wrist actigraphy was performed for a mean (s.d.) of 5.2 (0.9) nights in 3055 men (age: 67-96 years) participating in the Osteoporotic Fractures in Men Study (MrOS) and 4.1 (0.8) nights in 3052 women (age: 70-99 years) participating in the Study of Osteoporotic Fractures (SOF). A subgroup of 2862 men and 455 women also underwent polysomnography to measure sleep apnea severity. Results: Compared to those sleeping an average of 7-8 h per night, and after adjusting for multiple risk factors and medical conditions, a sleep duration of less than 5 h was associated with a body mass index (BMI) that was on average 2.5 kg/m2 (95% confidence interval (CI): 2.0-2.9) greater in men and 1.8 kg/m2 (95% CI: 1.1-2.4) greater in women. The odds of obesity (BMI >or= 30 kg/m2) was 3.7-fold greater (95% CI: 2.7-5.0) in men and 2.3-fold greater in women (95% CI: 1.6-3.1) who slept less than 5 h. Short sleep was also associated with central body fat distribution and increased percent body fat. These associations persisted after adjusting for sleep apnea, insomnia and daytime sleepiness. Conclusions: In older men and women, actigraphy-ascertained reduced sleep durations are strongly associated with greater adiposity.
ISSN:	0307-0565 1476-5497