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Prospective effects of pedometer use and class competitions on physical activity in youth: a cluster-randomized controlled trial [with consumer summary]
Suchert V, Isensee B, Sargent J, Weisser B, Hanewinkel R, Lauft Study Group
Preventive Medicine 2015 Dec;81:399-404
clinical trial
6/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: No; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: Yes; Intention-to-treat analysis: Yes; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

OBJECTIVE: To evaluate the immediate effects of a school-based multi-component program to foster a physically active lifestyle in adolescence. DESIGN/PARTICIPANTS: In a cluster-randomized controlled trial with pre- and post-assessment in 2014, 29 schools with 1,162 8th grade students (48% girls) from Germany were included. Age ranged from 12 to 17 years (mean 13.74; SD 0.67). INTERVENTION: While the control group attended education as usual, students in the intervention group received pedometers and took part in a class competition over a time period of 12 weeks. Classes with the most steps and best creative ideas to promote physical activity in everyday life were awarded. MAIN OUTCOME MEASURES: Primary outcomes included out-of-school sports activities (h/week), moderate to vigorous physical activity (days/week with a minimum of 60 min), active commuting (min/day), doing chores (min/day), and sedentary behavior (h/day) assessed through self-administered questionnaires as well as cardiorespiratory fitness measured using the 20-m shuttle-run test (completed laps). RESULTS: Significant interaction terms between group and wave of assessment were found on out-of-school sports activities (b = -1.09 (-1.89 to -0.29), p = 0.008), moderate to vigorous physical activity (b = -0.29 (-0.47 to -0.10), p = 0.002), and active commuting (b = -20.41 (-32.32 to -8.49), p = 0.001): students in the intervention group showed a higher increase of physical activity levels than students in the control group. The intervention effect on cardiorespiratory fitness missed significance marginally (b = -1.52 (-3.14 to 0.98), p = 0.065), There was no effect on students' sedentary behavior (b = 0.06 (-0.72 to 0.84), p = 0.881). CONCLUSIONS: An easy to administer school-based physical activity program (12 weeks) may enhance students' leisure-time physical activity. TRIAL REGISTRATION NUMBER: ISRCTN49482118.
Copyright by Academic Press.

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