‘Physical Activity 4 Everyone’ school-based intervention to prevent decline in adolescent physical activity levels: 12?month (mid-intervention) report on a cluster randomised trial


Background Adolescence is a recognised period of physical activity decline, particularly among low-income communities. We report the 12-month (midpoint) effects of a 2-year multicomponent physical activity intervention implemented in disadvantaged secondary schools.

Methods A cluster randomised trial was undertaken in 10 secondary schools located in disadvantaged areas in New South Wales, Australia. Students in Grade 7 were recruited, with follow-up in Grade 8. The intervention was guided by socioecological theory and included seven physical activity strategies, and six implementation adoption strategies. The primary outcome was mean minutes of moderate-to-vigorous physical activity (MVPA) per day assessed using Actigraph GT3X accelerometers. Outcome data were analysed using repeated measures linear mixed models.

Results At baseline, 1150 (93%) students participated in the data collection (mean age 12 years, 48% boys) and 1050 (79%) students participated at 12-month follow-up. By the 12-month follow-up, the six implementation adoption strategies had been used to support schools to deliver four of the seven physical activity elements. There was a significant group-by-time interaction for mean minutes of MVPA per day in favour of the intervention group (adjusted difference between groups at follow-up=3.85 min, 95% CI (0.79 to 6.91), p≤0.01), including significantly more vigorous physical activity (2.45 min, p≤0.01), equating to 27 min more MVPA per week.

Summary At 12-month follow-up, the intervention had reduced the decline in physical activity among adolescents from disadvantaged schools. The intervention may assist students to meet physical activity guidelines.

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Autor / Fonte:Rachel Sutherland, Elizabeth Campbell, David R Lubans, Philip J Morgan, Anthony D Okely, Nicole Nathan, Luke Wolfenden, Jarrod Wiese, Karen Gillham, Jenna Hollis, John Wiggers Br J Sports Med 2016;50:488-495 Published Online First: 10 September 2015 doi:1
Link: http://bjsm.bmj.com/content/50/8/488.full.pdf+html