Dept of Epidemiology, University of North Carolina at Chapel Hill, USA.
J Phys Act Health. 2011 Sep;8(7):971-7. doi: 10.1123/jpah.8.7.971.
Some researchers have questioned if activity programs would be more effective if based outside school (eg, community leagues) rather than within schools. This study compared participation in activity programs based within and outside of school, and estimated the associations between participation and moderate-vigorous physical activity (MVPA) among adolescent girls.
Within the Trial of Activity for Adolescent Girls, independent samples of 1559 6th-grade girls (age 11 to 12) and 3282 8th-grade girls (age 13 to 14) reported program participation using questionnaires. MVPA was measured using accelerometers. Linear mixed models accounted for school and site clustering.
Sixth-grade girls reported 5 times as many programs outside school as within school (4.1 vs. 0.8); daily MVPA was 0.29 minutes higher (1.2% of the mean) for each additional program outside school. Compared with 6th-grade girls, 8th-grade girls participated in 1.3 fewer programs outside school, while programs' association with MVPA was unchanged. Conversely, school programs' association with MVPA was greater in 8th grade. Daily MVPA was 1.33 minutes higher per school program, and participation declined 0.13.
Programs within and outside schools can both increase activity among adolescent girls. Intervention research should focus on increasing participation in school programs, and increasing movement during programs outside school.
一些研究人员质疑，如果活动项目基于校外（例如社区联盟）而不是校内，是否会更有效。本研究比较了校内和校外活动项目的参与情况，并估计了参与这些项目与青少年女性中中度至剧烈体力活动（MVPA）之间的关联。
在青少年女性活动试验中，使用问卷独立报告了 1559 名 6 年级女孩（11 至 12 岁）和 3282 名 8 年级女孩（13 至 14 岁）的项目参与情况。使用加速度计测量 MVPA。线性混合模型考虑了学校和地点聚类。
6 年级女孩报告的校外项目是校内项目的 5 倍（4.1 比 0.8）；校外每增加一个项目，每日 MVPA 就会增加 0.29 分钟（平均的 1.2%）。与 6 年级女孩相比，8 年级女孩校外项目参与减少了 1.3 个，而项目与 MVPA 的关联保持不变。相反，8 年级女孩的校内项目与 MVPA 的关联更大。每参加一个校内项目，每日 MVPA 就会增加 1.33 分钟，而参与度则下降了 0.13。
校内和校外的项目都可以增加青少年女性的活动量。干预研究应侧重于增加校内项目的参与度，并增加校外项目中的运动。
