VU University Medical Center, EMGO Institute for Health and Care Research, Department of Public and Occupational Health, Amsterdam, The Netherlands.
Int J Behav Nutr Phys Act. 2012 Jan 24;9:4. doi: 10.1186/1479-5868-9-4.
Screen time has been associated with pediatric overweight. However, it is unclear whether overweight predicts or is predicted by excessive amounts of screen time. The aim of this study was to examine the direction of the association between screen time and body fatness in Dutch adolescents.
Longitudinal data of 465 Dutch adolescents (mean age at baseline 13 years, 53% boys) was used. Body fatness (objectively measured BMI, four skin folds and waist- and hip circumference), self-reported time spent watching TV and computer use, and aerobic fitness (shuttle run test) were assessed in all participants at three time points during 12 months. Multi-level linear autoregressive analyses was used to examine whether screen time predicted body fatness in the following time period and whether body fatness predicted screen time. Analyses were performed for boys and girls separately and adjusted for ethnicity and aerobic fitness.
Time spent TV viewing did predict changes in BMI and hip circumference in boys, but not in girls, in the subsequent period. Computer time significantly predicted increases in skinfolds in boys and girls and increases in BMI in girls. Body fatness did not predict any changes in screen time.
The present study only partly supports the widely posited hypothesis that higher levels of screen time cause increases in body fatness. In addition, this study demonstrates that high levels of body fatness do not predict increases in screen time.
屏幕时间与儿童超重有关。然而，尚不清楚超重是由过多的屏幕时间引起的，还是由过多的屏幕时间预测的。本研究旨在检验荷兰青少年中屏幕时间与体脂肪之间的关联方向。
使用了 465 名荷兰青少年（基线时的平均年龄为 13 岁，53%为男孩）的纵向数据。在 12 个月的 3 个时间点，所有参与者均接受了身体脂肪（客观测量的 BMI、4 个皮褶和腰围和臀围）、自我报告的看电视和使用计算机的时间以及有氧健身（穿梭跑测试）的评估。使用多级线性自回归分析来检验屏幕时间是否在下一个时间段预测体脂肪，以及体脂肪是否预测屏幕时间。分别对男孩和女孩进行了分析，并根据种族和有氧健身进行了调整。
看电视的时间确实预测了男孩随后时期 BMI 和臀围的变化，但对女孩没有预测。计算机时间显著预测了男孩和女孩的皮褶增加以及女孩的 BMI 增加。体脂肪没有预测任何屏幕时间的变化。
本研究仅部分支持广泛提出的假设，即较高的屏幕时间会导致体脂肪增加。此外，本研究表明，高水平的体脂肪不会预测屏幕时间的增加。
