目的:确定学生亚群在心肺适应性和体力活动方面是否从基于学校的体力活动干预中受益。检查体力活动强度是否介导心肺健康的改善。
方法:对来自对照试验的个体参与者数据进行汇总分析,这些试验评估了基于学校的身体活动干预对心肺健康和设备测量的身体活动的影响。
方法:纳入了来自20项试验的6621名4-18岁儿童和青少年的数据。
方法:峰值耗氧量(VO2PeakmL/kg/min)和中等强度的体力活动分钟。
结果:干预措施适度改善了学生的心肺健康状况,增加了0.47mL/kg/min(95%CI0.33至0.61),但是效应在亚群中分布不均。女生和高年级学生比男生和低年级学生受益少,分别。初始健身水平较低的学生,那些基线体力活动水平较高的人比那些最初更健康、不太活跃的人受益更多,分别。干预对身体活动有适度的积极影响,每天大约额外一分钟的中等和剧烈的身体活动。变化剧烈,但不是中等强度,体力活动解释了少量(〜5%)对心肺适应性的干预作用。
结论:未来的干预措施应包括有针对性的策略,以满足女孩和年长学生的需求。干预也可以通过促进更剧烈强度的身体活动来改善。干预措施可以减轻青少年心肺健康状况的下降,增加身体活动,促进心血管健康,如果它们可以公平地提供,其影响在人口水平上持续。
OBJECTIVE: To determine if subpopulations of students benefit equally from school-based physical activity interventions in terms of cardiorespiratory fitness and physical activity. To examine if physical activity intensity mediates improvements in cardiorespiratory fitness.
METHODS: Pooled analysis of individual participant data from controlled trials that assessed the impact of school-based physical activity interventions on cardiorespiratory fitness and device-measured physical activity.
METHODS: Data for 6621 children and adolescents aged 4-18 years from 20 trials were included.
METHODS: Peak oxygen consumption (VO2Peak mL/kg/min) and minutes of moderate and vigorous physical activity.
RESULTS: Interventions modestly improved students\' cardiorespiratory fitness by 0.47 mL/kg/min (95% CI 0.33 to 0.61), but the effects were not distributed equally across subpopulations. Girls and older students benefited less than boys and younger students, respectively. Students with lower levels of initial fitness, and those with higher levels of baseline physical activity benefitted more than those who were initially fitter and less active, respectively. Interventions had a modest positive effect on physical activity with approximately one additional minute per day of both moderate and vigorous physical activity. Changes in vigorous, but not moderate intensity, physical activity explained a small amount (~5%) of the intervention effect on cardiorespiratory fitness.
CONCLUSIONS: Future interventions should include targeted strategies to address the needs of girls and older students. Interventions may also be improved by promoting more vigorous intensity physical activity. Interventions could mitigate declining youth cardiorespiratory fitness, increase physical activity and promote cardiovascular health if they can be delivered equitably and their effects sustained at the population level.