University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093 USA.
Prev Med. 2013 Nov;57(5):591-5. doi: 10.1016/j.ypmed.2013.08.003. Epub 2013 Aug 12.
To examine the relation of physical activity practices covering physical education (PE), recess, and classroom time in elementary schools to children's objectively measured physical activity during school.
Participants were 172 children from 97 elementary schools in the San Diego, CA and Seattle, WA USA regions recruited in 2009-2010. Children's moderate-to-vigorous physical activity (MVPA) during school was assessed via accelerometry, and school practices were assessed via survey of school informants. Multivariate linear mixed models were adjusted for participant demographics and unstandardized regression coefficients are reported. The 5 practices with the strongest associations with physical activity were combined into an index to investigate additive effects of these practices on children's MVPA.
Providing ≥ 100 min/week of PE (B=6.7 more min/day; p=.049), having ≤ 75 students/supervisor in recess (B=6.4 fewer min/day; p=.031), and having a PE teacher (B=5.8 more min/day; p=.089) were related to children's MVPA during school. Children at schools with 4 of the 5 practices in the index had 20 more min/day of MVPA during school than children at schools with 0 or 1 of the 5 practices (p<.001).
The presence of multiple school physical activity practices doubled children's physical activity during school.
研究小学体育课、课间休息和课堂时间等体育活动实践与儿童在校期间身体活动的客观测量值之间的关系。
参与者为 2009 年至 2010 年在美国加利福尼亚州圣地亚哥和华盛顿州西雅图地区的 97 所小学招募的 172 名儿童。通过加速度计评估儿童在校期间的中等到剧烈身体活动（MVPA），通过对学校信息员的调查评估学校实践。调整了参与者的人口统计学特征，并报告了未标准化回归系数的多变量线性混合模型。将与身体活动关联最强的 5 种实践综合为一个指数，以调查这些实践对儿童 MVPA 的累加效应。
每周提供≥100 分钟体育课（B=6.7 分钟/天；p=.049）、课间休息时学生/监督者人数≤75 人（B=6.4 分钟/天；p=.031）和有体育老师（B=5.8 分钟/天；p=.089）与儿童在校期间的 MVPA 相关。在指数中具有 5 种实践中的 4 种的儿童在校期间每天的 MVPA 比在指数中具有 0 种或 1 种实践的儿童多 20 分钟（p<.001）。
多种学校体育活动实践的存在使儿童在校期间的身体活动增加了一倍。
