Pennington Biomedical Research Center, Baton Rouge, LA.
Med Sci Sports Exerc. 2023 Jan 1;55(1):110-118. doi: 10.1249/MSS.0000000000003018. Epub 2022 Aug 12.
This study aimed to examine the effects of substituting sedentary time with sleep or physical activity on adiposity in a longitudinal sample of adolescents.
Adolescents (10-16 yr) were recruited for a prospective observational cohort. Parents and adolescents reported demographic characteristics and pubertal development. Accelerometry was used to measure sleep, physical activity, and sedentary time. Adiposity was quantified with imaging techniques. Isotemporal substitution modeling was conducted to examine the effect of substituting 10 min of sedentary time with sleep or differing intensities of physical activity. Results were stratified by sex and race and adjusted for covariates.
A total of 217 adolescents provided complete measures at both baseline and 2 yr later (58.1% White, 51.8% girls; 12.9 ± 1.9 yr at baseline). Sleep was negatively related to adiposity 2 yr later when considering other movement behaviors, but substituting baseline sedentary time with sleep was not related to future adiposity ( P > 0.05). In boys and non-White adolescents, substituting sedentary time with vigorous-intensity physical activity was related to lower adiposity 2 yr later ( P < 0.05). Substituting sedentary time for moderate- to vigorous-intensity physical activity was not associated with future adiposity.
Substituting sedentary time with vigorous-intensity physical activity was related to lower adiposity in later adolescence in certain groups. Opportunities to promote an adequate balance of sleep, sedentary time, and physical activity in all adolescents are encouraged for optimal development.
本研究旨在考察在青少年的纵向样本中，用睡眠或体力活动替代久坐时间对肥胖的影响。
招募青少年（10-16 岁）参加前瞻性观察队列研究。父母和青少年报告了人口统计学特征和青春期发育情况。加速度计用于测量睡眠、体力活动和久坐时间。使用成像技术来量化肥胖。等时替代模型用于研究用 10 分钟的久坐时间替代睡眠或不同强度的体力活动的效果。结果按性别和种族进行分层，并对协变量进行了调整。
共有 217 名青少年在基线和 2 年后提供了完整的测量数据（58.1%为白人，51.8%为女孩；基线时年龄为 12.9±1.9 岁）。考虑到其他运动行为，睡眠与 2 年后的肥胖呈负相关，但用基线久坐时间替代睡眠与未来肥胖无关（P>0.05）。在男孩和非白人青少年中，用剧烈强度的体力活动替代久坐时间与较低的肥胖率有关（P<0.05）。用中等到剧烈强度的体力活动替代久坐时间与未来肥胖无关。
在某些群体中，用剧烈强度的体力活动替代久坐时间与青少年后期较低的肥胖率有关。鼓励在所有青少年中提供充足的睡眠、久坐时间和体力活动的平衡机会，以促进最佳发育。
