Physical activity growth curves relate to adiposity in adolescents |
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| Institution: | 1. Department of Exercise Science, Concordia University, Montreal, Quebec, Canada;2. Centre de Recherche du CHU Sainte-Justine, Montreal, Quebec, Canada;3. School of Public Health, University of Alberta, Edmonton, Alberta, Canada;4. Department of Kinesiology and Physical Education, University of Toronto, Toronto, Ontario, Canada;5. Department of Social and Preventive Medicine, Université de Montréal, Montreal, Quebec, Canada;6. School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada;7. Department of Kinesiology and Physical Education, McGill University, Montreal, Quebec, Canada;8. Centre de formation médicale du Nouveau-Brunswick, Moncton, New Brunswick, Canada;9. Vitalité Health Network Research Centre, Moncton, New Brunswick, Canada;10. Department of family medicine, Université de Sherbrooke, Sherbrooke, Quebec, Canada;11. Centre de Recherche du Centre Hospitalier de l''Université de Montréal, Montreal, Quebec, Canada;1. Institute of Application Science, Harbin University of Science and Technology, Harbin 150080, China;2. Key Laboratory of Engineering Dielectric and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China;1. Department of Chronic Disease Epidemiology, Yale University School of Public Health, New Haven, CT;2. Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD;3. Yale Cancer Center, New Haven, CT;1. Hydrosolutions Ltd., 8005 Zürich, Switzerland;2. Institute of Environmental Engineering, ETH Zürich, 8093 Zürich, Switzerland;3. IBG-3 Agrosphere, Forschungszentrum Jülich, 52425 Jülich, Germany;4. Institute of Hydraulic Engineering, University of Stuttgart, 70569 Stuttgart, Germany |
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| Abstract: | PurposeFindings from prospective studies on associations between physical activity and adiposity among youth are inconsistent. Our aim was to describe physical activity trajectories during secondary school and examine the association with change in adiposity in youth.MethodsPhysical activity was measured in 20 survey cycles from 1999 to 2005; anthropometrics were measured in survey cycles 1, 12, and 19. Individual growth curves modeling moderate-to-vigorous physical activity (MVPA) and vigorous physical activity (VPA) were estimated. Estimates of initial level and rate of decline in MVPA and VPA bouts per week were included as potential predictors of body fat% and body mass index using age- and sex-specific linear regression.ResultsComplete data were available for 840 and 760 adolescents aged 12–13 years at baseline, followed from survey cycles 1–12 and 12–19, respectively. Among girls, yearly declines of one MVPA and one VPA bout per week during earlier adolescence were associated with increases of 0.19 (95% confidence interval CI], 0.02–0.36) and 0.47 (95% CI, 0.015–0.92) units of body fat%, respectively. In boys, a yearly decline of one MVPA bout per week was associated with an increase of 0.38 (95% CI, 0.05–0.70) units of body fat% during later adolescence.ConclusionsObesity prevention programs should include strategies to prevent declines in physical activity. |
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| Keywords: | Adiposity Adolescent Body composition Exercise Longitudinal studies Physical activity Obesity |
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