title: Mediating effects of resistance training skill competency on health-related fitness and physical activity: the ATLAS cluster randomised controlled trial.
abstract: The purpose of this study was to examine the mediating effect of resistance training skill competency on percentage of body fat, muscular fitness and physical activity among a sample of adolescent boys participating in a school-based obesity prevention intervention. Participants were 361 adolescent boys taking part in the Active Teen Leaders Avoiding Screen-time (ATLAS) cluster randomised controlled trial: a school-based program targeting the health behaviours of economically disadvantaged adolescent males considered "at-risk" of obesity. Body fat percentage (bioelectrical impedance), muscular fitness (hand grip dynamometry and push-ups), physical activity (accelerometry) and resistance training skill competency were assessed at baseline and post-intervention (i.e., 8 months). Three separate multi-level mediation models were analysed to investigate the potential mediating effects of resistance training skill competency on each of the study outcomes using a product-of-coefficients test. Analyses followed the intention-to-treat principle. The intervention had a significant impact on the resistance training skill competency of the boys, and improvements in skill competency significantly mediated the effect of the intervention on percentage of body fat and the combined muscular fitness score. No significant mediated effects were found for physical activity. Improving resistance training skill competency may be an effective strategy for achieving improvements in body composition and muscular fitness in adolescent boys.
authors.affiliation: a Priority Research Centre for Physical Activity and Nutrition, School of Education , University of Newcastle , Callaghan Campus, Newcastle , New South Wales , Australia.
authors.forename: Jordan J
authors.initials: JJ
authors.lastname: Smith
authors.affiliation: a Priority Research Centre for Physical Activity and Nutrition, School of Education , University of Newcastle , Callaghan Campus, Newcastle , New South Wales , Australia.
authors.forename: Philip J
authors.initials: PJ
authors.lastname: Morgan
authors.affiliation: a Priority Research Centre for Physical Activity and Nutrition, School of Education , University of Newcastle , Callaghan Campus, Newcastle , New South Wales , Australia.
authors.forename: Ronald C
authors.initials: RC
authors.lastname: Plotnikoff
authors.affiliation: b Department of Physical Education and Athletic Training , University of South Carolina , Columbia , South Carolina , United States.
authors.forename: David F
authors.initials: DF
authors.lastname: Stodden
authors.affiliation: a Priority Research Centre for Physical Activity and Nutrition, School of Education , University of Newcastle , Callaghan Campus, Newcastle , New South Wales , Australia.
authors.forename: David R
authors.initials: DR
authors.lastname: Lubans
mesh_terms: D000293:Adolescent; D001823:Body Composition; D050218:Body Fat Distribution; D002648:Child; D005080:Exercise Test; D015438:Health Behavior; D006801:Humans; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D009048:Motor Skills / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology; D009765:Obesity / Q000517:prevention & control; D010809:Physical Fitness; D055070:Resistance Training
keywords: Adolescent; movement skills; overweight; physical activity; physical fitness