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Temporal and bi-directional associations between sleep duration and physical activity/sedentary time in children: An international comparison

机译:儿童睡眠持续时间和身体活动/久坐时间之间的时间和双向关联:国际比较

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The purpose of this multinational and cross-sectional study was to investigate whether nighttime sleep duration was associated with physical activity (PA) and sedentary time (SED) the following day, whether daytime PA/SED were associated with sleep duration the subsequent night, and whether the associations were modified by sex and study sites. Data from 5779 children aged 9-11 years were analyzed. A waist-worn Actigraph GT3X + accelerometer was used to assess children's 24-h movement behaviours for 7 days, i.e. sleep duration, total SED, light-intensity physical activity (LPA), and moderate-to vigorous-intensity physical activity (MVPA). Multilevel linear regression models were used to account for the repeated measures nested within participants (there were up to 7 sleep - PA/SED and PA/SED - sleep pairings per participant) and schools, and adjusted for covariates. To facilitate interpretation, all sleep and PA/SED variables were standardized. Results showed that the relationship between sleep and PA/SED is bi-directional in this international sample of children. Specifically, for each one standard deviation (SD) unit increase in sleep duration, SED the following day decreased by 0.04 SD units, while LPA and MVPA increased by 0.04 and 0.02 SD units, respectively. Sleep duration decreased by 0.02 SD units and increased by 0.04 SD units for each one SD unit increase in SED and MVPA, respectively. Sleep duration was not affected by changes in LPA. These associations differed across sex and study sites in both directions. However, since the observed effect sizes are subtle, public health initiatives should consider the clinical and practical relevance of these findings.
机译:该跨国和横截面研究的目的是调查夜间睡眠持续时间是否与第二天有关的夜间睡眠持续时间(PA)和久坐时间(SED),无论是日间PA / SED是否与随后的夜晚相关联的睡眠持续时间协会是否被性别和学习地点修改。分析了5779岁儿童9-11岁儿童的数据。腰部磨损的Actigraph GT3X +加速度计用于评估儿童的24小时运动行为7天,即睡眠持续时间,总体,光强度身体活性(LPA)和中等至剧烈 - 强度的身体活动(MVPA) 。多级线性回归模型用于考虑参与者内嵌套的重复措施(最多7睡眠 - & PA / SED和PA / SED - >每位参与者的睡眠配对)和学校,并调整协变量。为了促进解释,所有睡眠和PA / SED变量都标准化。结果表明,睡眠与PA / SED之间的关系在这个国际儿童样本中是双向的。具体地,对于每个标准偏差(SD)单元增加睡眠持续时间,SED第二天减少了0.04SD单元,而LPA和MVPA分别增加0.04和0.02 SD单元。睡眠持续时间减少0.02 SD单元,并且分别增加了SED和MVPA的每个SD单元的0.04 SD单元。睡眠持续时间不受LPA变化的影响。这些关联在两个方向上的性别和学习网站不同。然而,由于观察到的效果大小是微妙的,公共卫生举措应考虑这些发现的临床和实际相关性。

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