School Physical Activity Intervention Effect on Adolescents' Performance in Maths

Purpose The primary aim of this study was to test the effect of a school-based physical activity intervention on adolescents' performance in mathematics. A secondary aim was to explore potential mechanisms that might explain the intervention effect. Methods The Activity and Motivation in Physical EDucation (AMPED) intervention was evaluated using a two-arm cluster randomized controlled trial in 14 secondary schools located in low socioeconomic areas of Western Sydney, Australia. Study participants (n=1,173) were Grade 8 students (mean age = 12.94 years, SD = .54). The multi-component intervention was designed to help teachers maximize students' opportunities for moderate-to-vigorous physical activity (MVPA) during physical education (PE) and enhance students' motivation towards PE. Mathematics performance was assessed as part of national testing in Grade 7, which was the year before the trial began and then again in Grade 9. Potential mediators were: (i) proportion of PE lesson time that students spent in MVPA and leisure-time MVPA (%), measured using Actigraph GT3X+ accelerometers, and (ii) students' self-reported engagement (behavioral, emotional, and cognitive) during mathematics lessons. Mediators were assessed at baseline (Grade 8) and follow-up (Grade 9, 14-15 months after baseline). Results The effect of the intervention on mathematics performance was small-to-medium (β = .16, p

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