Featured Article: Bidirectional Effects of Sleep and Sedentary Behavior Among Toddlers: A Dynamic Multilevel Modeling Approach
Featured Article: Bidirectional Effects of Sleep and Sedentary Behavior Among Toddlers: A Dynamic Multilevel Modeling Approach
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DOI：
10.1093/jpepsy/jsy089
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发表时间：
2019-04-01
影响因子：
3.6
通讯作者：
Black, Maureen M.
中科院分区：
文献类型：
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作者：
Armstrong, Bridget;Covington, Lauren B.;Black, Maureen M.
目的探讨幼儿夜间睡眠和久坐活动的双向效应。方法对195名参加肥胖预防试验的幼儿（平均年龄27个月）的活动加速度计数据进行分析。幼儿连续佩戴加速度计长达7天。夜间睡眠被定义为晚上8点到第二天早上8点之间的睡眠分钟数。使用先前建立的幼儿活动临界点定义久坐行为（分钟）。采用动态结构方程模型（DSEM）对影响幼儿睡眠质量的因素进行分析，结果幼儿平均每晚静坐活动时间为172min（约3hr），睡眠时间为460min（约8hr）。自回归交叉滞后多层次模型显示睡眠和久坐活动显着的自回归。交叉滞后值显示，睡眠减少预示着第二天久坐活动的增加，而久坐活动预示着当晚的睡眠。对于89%的样本，人内标准化交叉滞后效应的睡眠久坐不动大于交叉滞后效应久坐不动sleep.Conclusions结果表明，平均而言，夜间睡眠是一个更强的预测随后久坐不动的行为（相比，相反），这是大多数幼儿的情况。研究结果强调了睡眠和久坐活动之间个体间关联的重要性。本研究是一个例子，如何DSEM方法可以用来询问有关格兰杰因果交叉滞后的变量之间的关系，无论是在个人和之间的问题。
Objective To examine the bidirectional effects of objectively measured nighttime sleep and sedentary activity among toddlers.Method Actical accelerometer data were analyzed for 195 toddlers participating in an obesity prevention trial (mean age = 27months). Toddlers wore the accelerometers for up to 7 consecutive days. Nighttime sleep was defined as the number of minutes asleep between the hours of 8 pm and 8 am the following morning. Sedentary behavior (in minutes) was defined using previously established Actical cut points for toddlers. Variables were lagged and parsed into latent within- and between-person components, using dynamic structural equation modeling (DSEM).Results Toddlers spent an average of 172min (similar to 3hr) in sedentary activity and slept an average of 460min (similar to 8hr) per night. An autoregressive cross-lagged multilevel model revealed significant autoregression for both sleep and sedentary activity. Cross-lagged values revealed that decreased sleep predicted increased next-day sedentary activity, and sedentary activity predicted that night's sleep. For 89% of the sample, the within-person standardized cross-lagged effects of sleep on sedentary were larger than the cross-lagged effects of sedentary on sleep.Conclusions Results suggest that, on average, nighttime sleep is a stronger predictor of subsequent sedentary behavior (compared with the reverse), and this is the case for the majority of toddlers. Findings highlight the importance of interindividual associations between sleep and sedentary activity. The present study is an example of how DSEM methods can be used to ask questions about Granger-causal cross-lagged relations between variables, both within and between individuals.