Bruner Mark W, Chad Karen E, Beattie-Flath Jodie A, Humbert M Louise, Verrall Tanya C, Vu Lan, Muhajarine Nazeem
School of Kinesiology and Health Studies, Queen's University, Kingston, Ontario K7L 3N6, Canada.
Pediatr Exerc Sci. 2009 Nov;21(4):421-35. doi: 10.1123/pes.21.4.421.
This study monitored the physical activity behavior of adolescent students over a ten month school year. Physical activity was assessed at two month intervals using self-report and objective (Actical accelerometers) measures. Self-report results (n = 547) indicated a decline in physical activity throughout the school year for all grades and genders. The decline was attributed largely to a decrease in organized activity participation. Objective physical activity results (n = 40) revealed a significant decline in activity in the latter half of the school year (February to June). Declining physical activity was attributed to a decrease in vigorous activity which was consistent across grade and gender. Collectively, the results highlight the importance of promoting consistent opportunities for adolescents to be active throughout the school year.
本研究在一个长达十个月的学年里监测了青少年学生的身体活动行为。每隔两个月使用自我报告和客观（Actical加速度计）测量方法对身体活动进行评估。自我报告结果（n = 547）表明，在整个学年中，所有年级和性别的学生身体活动均呈下降趋势。这种下降主要归因于有组织活动参与的减少。客观身体活动结果（n = 40）显示，在学年后半段（2月至6月）活动显著下降。身体活动的下降归因于剧烈活动的减少，这在各年级和性别中都是一致的。总体而言，研究结果凸显了在整个学年为青少年提供持续的身体活动机会的重要性。
