What is the contribution of each physical activity domain to total physical activity in adolescents?

Abstract The present study aimed to verify the contribution of different physical activity domains to “total physical activity” in Brazilian adolescents. This is a cross-sectional study using secondary data from the third edition of the National School Health Survey - PeNSE, 2015. The sample consisted of 100,497 adolescents of both sexes enrolled in the 9th grade of elementary schools. A linear regression model was used to verify how much each domain contributed to total physical activity, considering gender, type of municipality and region. The domain with the largest contribution to “total physical activity” regardless of sociodemographic and environmental variables was “extra-school physical activity” (R2 = 0.60), followed by “active commuting” (R2 = 0.34), and finally “Physical Education classes” (R2 = 0.23). The contribution of the different domains varied by gender, type of municipality and region, and it was concluded that “extra-school physical activity” make the greatest contribution to “total physical activity”, followed by “active commuting” and “Physical Education classes”. In addition, variation was observed in the contribution of domains by gender, type of municipality and region.

摘要 本研究旨在验证不同身体活动领域对巴西青少年"总体身体活动（total physical activity）"的贡献程度。本研究为横断面研究，采用2015年第三版全国学校健康调查（National School Health Survey - PeNSE）的二手数据开展分析。研究样本包含100497名就读于小学九年级的男女青少年。本研究构建线性回归模型，结合性别、城市类型与区域变量，分析各身体活动领域对总体身体活动的贡献占比。结果显示，在不考虑社会人口学特征与环境变量的情况下，对"总体身体活动"贡献最大的领域为校外身体活动（extra-school physical activity）（决定系数R²=0.60），其次为主动通勤（active commuting）（R²=0.34），最后为体育课（Physical Education classes）（R²=0.23）。不同身体活动领域的贡献程度随性别、城市类型与区域存在显著差异。研究最终得出结论：校外身体活动对巴西青少年总体身体活动的贡献最大，其次为主动通勤与体育课。此外，各身体活动领域的贡献程度确实存在因性别、城市类型与区域而异的群体差异。