Research Center in Physical Activity and Health, Department of Physical Education, School of Sports, Federal University of Santa Catarina, Brazil.
Healthy Active Living and Obesity Research Group, Children's Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada.
Public Health. 2021 Jun;195:32-38. doi: 10.1016/j.puhe.2021.03.029. Epub 2021 May 24.
Different screen time activities may be related to sleep, physical activity, and sedentary behavior. The objective was to examine the association between self-reported screen time activities and accelerometer-measured 24-h movement behaviors.
This was a cross-sectional study.
Adolescents' (n = 718, 50.4% girls, 16 years) sleep duration, sedentary behavior, light-intensity physical activity (LPA), and moderate-to-vigorous physical activity (MVPA) were estimated with wrist-worn accelerometry. Time spent on screen time activities related to studying, working, watching videos, playing video games, and using social media was self-reported. Multilevel linear regressions were used to test the association between screen time with sleep, sedentary behavior, and physical activity.
Boys and girls slept 6.4 and 6.7 h per night, spent 10.4 and 10.1 h/d in sedentary behavior, spent 4.0 and 4.4 h/d in LPA, and spent 34.7 and 29.2 min/d in MVPA, respectively. Studying was inversely related to LPA and MVPA. Working was inversely related to sleep and positively related to LPA. Watching videos was associated with lower LPA and MVPA. For boys, videogames were associated with increased sedentary behavior and lower LPA and MVPA. For girls, studying and/or using social media were associated with lower LPA and MVPA.
Indicators of screen time were associated with different accelerometer-measured 24-h movement behaviors in this sample of Brazilian adolescents.
不同的屏幕时间活动可能与睡眠、身体活动和久坐行为有关。本研究旨在探讨自我报告的屏幕时间活动与加速度计测量的 24 小时运动行为之间的关系。
这是一项横断面研究。
通过腕戴加速度计估计青少年（n=718，50.4%为女孩，16 岁）的睡眠持续时间、久坐行为、低强度体力活动（LPA）和中高强度体力活动（MVPA）。自我报告了与学习、工作、观看视频、玩电子游戏和使用社交媒体相关的屏幕时间活动所花费的时间。使用多层次线性回归来检验屏幕时间与睡眠、久坐行为和体力活动之间的关系。
男孩和女孩每晚分别睡 6.4 和 6.7 小时，每天分别有 10.4 和 10.1 小时处于久坐行为中，每天分别有 4.0 和 4.4 小时进行 LPA，每天分别有 34.7 和 29.2 分钟进行 MVPA。学习与 LPA 和 MVPA 呈负相关。工作与睡眠呈负相关，与 LPA 呈正相关。观看视频与 LPA 和 MVPA 呈负相关。对于男孩，电子游戏与久坐行为增加以及 LPA 和 MVPA 减少有关。对于女孩，学习和/或使用社交媒体与 LPA 和 MVPA 减少有关。
在本巴西青少年样本中，屏幕时间指标与加速度计测量的 24 小时运动行为存在差异。
