Karin A Pfeiffer1, Lorraine B Robbins2, Jiying Ling2, Dhruv B Sharma3, Danielle M Dalimonte-Merckling4, Vicki R Voskuil5, Niko Kaciroti6, Kenneth Resnicow7. 1. Department of Kinesiology, Michigan State University, East Lansing, Michigan. 2. College of Nursing, Michigan State University, East Lansing, Michigan. 3. Center for Statistical Training and Consulting, Michigan State University, East Lansing, Michigan. 4. Human Development and Family Studies, Michigan State University, East Lansing, Michigan. 5. Department of Nursing, Hope College, Holland, Michigan. 6. Center for Growth and Development, University of Michigan, Ann Arbor, Michigan. 7. School of Public Health, University of Michigan, Ann Arbor, Michigan.
Abstract
BACKGROUND: Limited, mixed evidence exists regarding the effectiveness of physical activity interventions on adiposity and aerobic performance in adolescent underrepresented populations. OBJECTIVE: To examine effects of Girls on the Move on body mass index z-scores (BMI-z), percent (%) body fat, and aerobic performance in fifth- to eighth-grade underrepresented girls. METHODS: A group randomized trial, involving 12 intervention and 12 control schools in low-income areas, was conducted. Participants (n = 1519) were low-active girls. The 17-week intervention included (a) a physical activity club, (b) two motivational interviewing sessions, and (c) one Internet-based session. BMI-z was determined from measured height and weight; % body fat was assessed using bioelectric impedance. Aerobic performance was assessed using a shuttle run. Demographics, physical activity (accelerometer), and pubertal development were assessed. Linear mixed models, adjusting for baseline, were used to examine group differences in postintervention. RESULTS: No significant between-group differences in BMI-z existed at postintervention, but % body fat increased less among intervention than control group girls (Mchange = 0.43% vs 0.73%). Aerobic performance decreased less in intervention vs control (Mchange = -0.39 vs -0.57). CONCLUSIONS: Although the intervention positively impacted % body fat and aerobic performance in underrepresented girls, more research is necessary to determine optimal implementation for yielding greater effects.
RCT Entities:
BACKGROUND: Limited, mixed evidence exists regarding the effectiveness of physical activity interventions on adiposity and aerobic performance in adolescent underrepresented populations. OBJECTIVE: To examine effects of Girls on the Move on body mass index z-scores (BMI-z), percent (%) body fat, and aerobic performance in fifth- to eighth-grade underrepresented girls. METHODS: A group randomized trial, involving 12 intervention and 12 control schools in low-income areas, was conducted. Participants (n = 1519) were low-active girls. The 17-week intervention included (a) a physical activity club, (b) two motivational interviewing sessions, and (c) one Internet-based session. BMI-z was determined from measured height and weight; % body fat was assessed using bioelectric impedance. Aerobic performance was assessed using a shuttle run. Demographics, physical activity (accelerometer), and pubertal development were assessed. Linear mixed models, adjusting for baseline, were used to examine group differences in postintervention. RESULTS: No significant between-group differences in BMI-z existed at postintervention, but % body fat increased less among intervention than control group girls (Mchange = 0.43% vs 0.73%). Aerobic performance decreased less in intervention vs control (Mchange = -0.39 vs -0.57). CONCLUSIONS: Although the intervention positively impacted % body fat and aerobic performance in underrepresented girls, more research is necessary to determine optimal implementation for yielding greater effects.
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