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Examination of Physical Activity in Adolescents Over the School Year

Mark W. Bruner, Karen E. Chad, Jodie A. Beattie-Flath, M. Louise Humbert, Tanya C. Verrall, Lan Vu, and Nazeem Muhajarine

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 selfreport 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.