Kishman Erin E, Breneman Charity B, Sparks Joshua R, Wang Xuewen
Department of Exercise Science, Noman J. Arnold School of Public Health, University of South Carolina, Columbia, South Carolina, United States.
Women's Health and Reproductive Endocrinology Laboratory, Pennington Biomedical Research Center, Louisiana State University, Baton Rouge, Louisiana, United States.
Sleep Biol Rhythms. 2023 Apr;21(2):175-183. doi: 10.1007/s41105-022-00429-x. Epub 2022 Nov 11.
The relationship between sleep and adiposity in older women remains unclear partly due to the reliance of body mass index as a measure of adiposity. The purpose of this study was to investigate associations between objectively measured sleep characteristics and body composition measured by dual energy x-ray absorptiometry (DXA) in older women. A secondary purpose was to examine if physical function mediates this relationship.
Non-obese older women (ages 60-75 years, n=102) were included in the study. Total sleep time (TST), time in bed (TIB), sleep efficiency (SE), and wake after sleep onset (WASO) were determined by actigraphy. A battery of tests was used to assess physical function.
With adjustment for age, there was a negative association between TST and TIB with lean mass. Both grip strength and dominant leg extension were associated with TST, TIB, and lean mass; the associations between TST and TIB with lean mass were lost after adjusting for grip strength or leg extension strength. Additionally, SE was negatively associated with total, gynoid, and trunk lean mass, and there was a positive association between TST and percent trunk fat, and WASO and gynoid lean mass, with age adjusted.
Sleep characteristics, TST, TIB, SE, and WASO, were associated body composition measures in this sample of older women. The relationship between TST and TIB with body composition was mediated, in part, by grip strength and leg extension strength.
老年女性睡眠与肥胖之间的关系仍不明确，部分原因是依赖体重指数作为肥胖的衡量指标。本研究的目的是调查老年女性客观测量的睡眠特征与通过双能X线吸收法（DXA）测量的身体成分之间的关联。第二个目的是检验身体功能是否介导这种关系。
本研究纳入了非肥胖老年女性（年龄60 - 75岁，n = 102）。通过活动记录仪确定总睡眠时间（TST）、卧床时间（TIB）、睡眠效率（SE）和睡眠开始后觉醒时间（WASO）。使用一系列测试来评估身体功能。
在调整年龄后，TST和TIB与瘦体重呈负相关。握力和优势腿伸展均与TST、TIB和瘦体重相关；在调整握力或腿部伸展力量后，TST和TIB与瘦体重之间的关联消失。此外，在调整年龄后，SE与总瘦体重、臀部瘦体重和躯干瘦体重呈负相关，TST与躯干脂肪百分比呈正相关，WASO与臀部瘦体重呈正相关。
在这个老年女性样本中，睡眠特征、TST、TIB、SE和WASO与身体成分测量值相关。TST和TIB与身体成分之间的关系部分由握力和腿部伸展力量介导。
