Document Detail

Potential moderators and mediators of intervention effects in an obesity prevention program for adolescent boys from disadvantaged schools.
MedLine Citation:
PMID:  22575499     Owner:  NLM     Status:  Publisher    
OBJECTIVES: The purpose of this study was to explore potential moderators and mediators of intervention effects in the Physical Activity Leaders (PALs) obesity prevention program for adolescent boys from disadvantaged secondary schools. DESIGN: Group randomized controlled trial. METHODS: One hundred adolescent boys (mean age=14.3 (0.6) years) from four schools were randomized to the PALs intervention or a control group for the 6-month study period. The primary outcome was change in BMI and secondary outcomes were physical activity assessed using pedometers and constructs from Social Cognitive Theory (SCT) assessed using a questionnaire. RESULTS: Moderation analyses revealed a significant weight status interaction for BMI (p=0.04), indicating stronger intervention effects for youth classified as overweight/obese at baseline. The intervention had a significant effect on resistance training self-efficacy (p<0.001), but none of the SCT constructs satisfied the criteria for mediation. The number of intervention sessions attended was associated with changes in BMI (r=-0.38, p=0.001), resistance training self-efficacy (r=0.42, p<0.001) and physical activity behavioral strategies (r=0.26, p=0.018). Changes in BMI were also associated with changes in resistance training self-efficacy (r=-0.21, p=0.06) and physical activity behavioral strategies (r=-0.29, p=0.009). CONCLUSIONS: A school-based intervention incorporating student leadership increased adolescent boys' resistance training self-efficacy, but changes in physical activity were not detected and none of the SCT constructs satisfied the criteria for mediation. Baseline weight status was a moderator of intervention effect with the strongest intervention effects observed among overweight and obese adolescent boys.
David R Lubans; Philip J Morgan; Robin Callister
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-5-8
Journal Detail:
Title:  Journal of science and medicine in sport / Sports Medicine Australia     Volume:  -     ISSN:  1878-1861     ISO Abbreviation:  -     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-5-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9812598     Medline TA:  J Sci Med Sport     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Sports Medicine Australia. Published by Elsevier Ltd. All rights reserved.
School of Education, University of Newcastle, NSW 2308, Australia.
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