儿童睡眠时间、久坐行为和身体活动与肥胖指标的构成关联。

Compositional associations of time spent in sleep, sedentary behavior and physical activity with obesity measures in children.

机构信息

Department of Public Health Sciences, Queen's University, Kingston, ON, Canada.

School of Kinesiology and Health Studies, Queen's University, Kingston, ON, Canada.

出版信息

Int J Obes (Lond). 2018 Aug;42(8):1508-1514. doi: 10.1038/s41366-018-0053-x. Epub 2018 Mar 5.

DOI:10.1038/s41366-018-0053-x

PMID:29568110

Abstract

BACKGROUND/OBJECTIVES: The 24 h day is made up of four movement behaviors: sleep, sedentary behavior (SB), light intensity physical activity (LIPA), and moderate-to-vigorous physical activity (MVPA). Previous studies examining associations between movement behaviors and obesity have used flawed statistical methods that did not account for the co-dependent and compositional nature of movement behaviors. Our objective was to use compositional data analysis methods to investigate the relationships between movement behaviors and obesity measures among children.

SUBJECTS/METHODS: Participants were 434 children aged 10-13 years. They wore an accelerometer for 7 days to determine time spent in SB, LIPA, and MVPA. Sleep duration was determined from the accelerometer and a log. The obesity measures were the body mass index, waist circumference, and fat mass index. Compositional data analysis was used to estimate whether the composition of movement behaviors was associated with obesity measures, and the extent to which changing time in movement behaviors within the movement behavior composition was associated with changes in obesity measures.

RESULTS

The composition of movement behaviors across the 24 h day was associated with all three obesity measures (p < 0.001). Relative to other movement behaviors, time spent in MVPA was negatively associated with obesity measures (p < 0.01), time spent in LIPA was positively associated with obesity measures (p < 0.05), while time spent in SB and sleep were not associated with obesity measures. The estimates suggested that an 18 min/day increase in MVPA, 21 min/day decrease in LIPA, 87 min/day decrease in SB, or 67 min/day increase in sleep relative to the remaining behaviors would be associated with a 0.1 unit decrease in BMI z-score.

CONCLUSIONS

The composition of movement behaviors across the day is associated with obesity measures. The findings suggest that changing the movement behavior composition by increasing MVPA and decreasing LIPA would be the most effective approach for improving obesity measures.

摘要

背景/目的：24 小时由四种活动行为组成：睡眠、久坐行为（SB）、低强度体力活动（LIPA）和中高强度体力活动（MVPA）。之前研究肥胖与活动行为之间关系的研究使用了有缺陷的统计方法，这些方法没有考虑到活动行为的相互依赖和组成性质。我们的目的是使用成分数据分析方法来研究儿童的活动行为与肥胖指标之间的关系。

受试者/方法：参与者为 434 名 10-13 岁的儿童。他们佩戴加速度计 7 天，以确定 SB、LIPA 和 MVPA 的时间。睡眠时长是根据加速度计和日志确定的。肥胖指标是体重指数、腰围和脂肪质量指数。采用成分数据分析方法来评估 24 小时内活动行为的组成是否与肥胖指标有关，以及改变活动行为组成内的活动行为时间与肥胖指标变化之间的关系程度。

结果

24 小时内活动行为的组成与所有三种肥胖指标均相关（p<0.001）。与其他活动行为相比，MVPA 时间与肥胖指标呈负相关（p<0.01），LIPA 时间与肥胖指标呈正相关（p<0.05），而 SB 和睡眠时间与肥胖指标无关。研究结果表明，与其他行为相比，每天增加 18 分钟 MVPA、减少 21 分钟 LIPA、减少 87 分钟 SB 或增加 67 分钟睡眠，与 BMI z 评分降低 0.1 个单位相关。