| Physical activity as a substitute for sedentary behavior in youth. | |
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MedLine Citation:
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PMID: 15946114 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND: Youth may choose to be sedentary rather than physically active. PURPOSE: The purpose of this study was to use behavioral economics methods to investigate how experimental changes in the amount of sedentary behaviors influenced physical activity. METHODS: Fifty-eight 8- to 16-year-old youth were studied in a within-subject crossover design with three 3-week phases: baseline, increasing, and decreasing targeted sedentary behaviors by 25% to 50%. RESULTS: At baseline, boys were more active than girls (518.9 vs. 401.2 accelerometer counts/min, p = .02), and obese youth more sedentary than nonobese youth (240.5 vs. 174.4 min/day, p = .003). During the increase sedentary behavior phase, targeted sedentary behaviors increased by 52.1%, with girls increasing sedentary behaviors more than boys (114.7 vs. 79.8 min/day, p = .04). Physical activity decreased (-48.3 counts/min, p < .01) when sedentary behaviors increased, with obese youth decreasing total and moderate to vigorous physical activity (MVPA) more than nonobese youth (-110.4 vs. 8.9 counts/min, p < .001; -3.3 vs. -.03 % MVPA, p = .013). During the decrease sedentary behavior phase, targeted sedentary behaviors decreased by 55.6% from baseline as nonobese youth increased physical activity, whereas obese youth decreased physical activity (55.8 vs. -48.0 counts/min, p = .042; 1.1 vs. -2.1% MVPA, p = .021). Youth who substituted physical activity when sedentary behaviors were increased had greater standardized body mass index (z-body mass index = 1.4 vs. 0.4, p = .018), whereas youth who substituted physical activity when sedentary behaviors were decreased were less active at baseline (396.1 vs. 513.7 counts/min, p = .035). CONCLUSIONS: Behavioral economics provides a methodology to understand changes in physical activity when sedentary behaviors are modified and to identify factors associated with substitution of physically active for sedentary behaviors. |
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Authors:
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Leonard H Epstein; James N Roemmich; Rocco A Paluch; Hollie A Raynor |
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Publication Detail:
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Type: Clinical Trial; Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Annals of behavioral medicine : a publication of the Society of Behavioral Medicine Volume: 29 ISSN: 0883-6612 ISO Abbreviation: Ann Behav Med Publication Date: 2005 Jun |
Date Detail:
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Created Date: 2005-06-10 Completed Date: 2005-10-19 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 8510246 Medline TA: Ann Behav Med Country: United States |
Other Details:
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Languages: eng Pagination: 200-9 Citation Subset: IM |
Affiliation:
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Department of Pediatrics, School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY 14214-3000, USA. LHENET@acsu.buffalo.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Activities of Daily Living Adolescent Adolescent Behavior Child Child Behavior Cross-Over Studies Exercise* Female Financing, Personal* Health Behavior Humans Intervention Studies Life Style Male Motivation Obesity / prevention & control Physical Fitness* Recreation Sex Factors |
| Grant Support | |
ID/Acronym/Agency:
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R01 HD 39778/HD/NICHD NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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