J Phys Act Health. 2018 Jun 1;15(6):457-461. doi: 10.1123/jpah.2016-0676. Epub 2018 Mar 23.
To investigate the patterns of physical activity (PA) and screen time among children and adolescents attended by the Brazilian National Health System.
This cross-sectional study was conducted in the city of Bauru, São Paulo, Brazil. The sample was composed of 270 children and adolescents attending 5 basic health care units. PA and screen time were assessed through a questionnaire. Economic status, sex, and body composition variables were used as covariates.
Boys were more likely to be active when compared with girls (odds ratio = 2.56; 95% confidence interval, 1.43-4.58). Children and adolescents who accumulated less screen time were more likely to be in the most active group (odds ratio = 0.41; 95% confidence interval, 0.24-0.72). When comparing data year on year, we found that the level of PA has not changed significantly among children aged 7-10 years; however, at the age of 10, we noticed a significant reduction in PA scores, which kept decreasing until the age of 12. Regarding screen time, the situation was the opposite, with the amount of time spent in this behavior increasing over the years.
Our results showed an association between low PA levels and high amount of screen time among children and adolescents, showing that is necessary to encourage an active lifestyle, decreasing time spent on television, computers, cell phones, and video games.
调查巴西国家卫生系统（Brazilian National Health System）服务的儿童和青少年的身体活动（PA）和屏幕时间模式。
本横断面研究在巴西圣保罗的包鲁市进行。该样本由 5 个基本医疗保健单位的 270 名儿童和青少年组成。通过问卷评估 PA 和屏幕时间。经济状况、性别和身体成分变量被用作协变量。
与女孩相比，男孩更有可能活跃（比值比 = 2.56；95%置信区间，1.43-4.58）。累计屏幕时间较少的儿童和青少年更有可能属于最活跃组（比值比 = 0.41；95%置信区间，0.24-0.72）。逐年比较数据时，我们发现 7-10 岁儿童的 PA 水平没有显著变化；然而，在 10 岁时，我们注意到 PA 评分显著降低，直到 12 岁时才有所下降。关于屏幕时间，情况正好相反，这种行为的时间随着时间的推移而增加。
我们的结果表明，儿童和青少年中低水平的 PA 水平与长时间的屏幕时间之间存在关联，这表明有必要鼓励积极的生活方式，减少花在电视、电脑、手机和视频游戏上的时间。
