Hart C N, Hawley N, Davey A, Carskadon M, Raynor H, Jelalian E, Owens J, Considine R, Wing R R
Center for Obesity Research and Education, Department of Social and Behavioral Sciences, College of Public Health, Temple University, Philadelphia, USA.
Department of Chronic Disease Epidemiology, Yale University, New Haven, USA.
Pediatr Obes. 2017 Dec;12(6):462-467. doi: 10.1111/ijpo.12166. Epub 2016 Jul 15.
Paediatric observational studies demonstrate associations between sleep, television viewing and potential changes in daytime activity levels.
OBJECTIVE(S): To determine whether experimental changes in sleep lead to changes in children's sedentary and physical activities.
Using a within-subject counterbalanced design, 37 children 8-11 years old completed a 3-week study. Children slept their typical amount during a baseline week and were then randomized to increase or decrease mean time in bed by 1.5 h/night for 1 week; the alternate schedule was completed the final week. Children wore actigraphs on their non-dominant wrist and completed 3-d physical activity recalls each week.
Children reported watching more television (p < 0.001) and demonstrated lower daytime actigraph-measured activity counts per epoch (p = 0.03) when sleep was decreased (compared with increased). However, total actigraph-measured activity counts accrued throughout the entire waking period were higher when sleep was decreased (and children were awake for longer) than when it was increased (p < 0.001).
CONCLUSION(S): Short sleep during childhood may lead to increased television viewing and decreased mean activity levels. Although additional time awake may help to counteract negative effects of short sleep, increases in reported sedentary activities could contribute to weight gain over time.
儿科观察性研究表明睡眠、看电视与白天活动水平的潜在变化之间存在关联。
确定睡眠的实验性变化是否会导致儿童久坐和身体活动的改变。
采用受试者内平衡设计，37名8至11岁的儿童完成了一项为期3周的研究。儿童在基线周按其通常的睡眠时间睡觉，然后随机分为两组，一组每晚在床上的平均时间增加1.5小时，另一组减少1.5小时，为期1周；在最后一周完成交替的时间表。儿童在非优势手腕上佩戴活动记录仪，并每周完成3天的身体活动回顾。
与睡眠增加时相比，睡眠减少时儿童报告看电视的时间更多（p<0.001），且白天活动记录仪测量的每个时段的活动计数更低（p=0.03）。然而，睡眠减少时（儿童醒着的时间更长）整个清醒期活动记录仪测量的总活动计数比睡眠增加时更高（p<0.001）。
儿童期睡眠不足可能导致看电视时间增加和平均活动水平降低。虽然额外的清醒时间可能有助于抵消短睡眠的负面影响，但久坐活动的增加可能会随着时间的推移导致体重增加。
