| Postexercise fat oxidation: effect of exercise duration, intensity, and modality. | |
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MedLine Citation:
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PMID: 20175430 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Postexercise fat oxidation may be important for exercise prescription aimed at optimizing fat loss. The authors examined the effects of exercise intensity, duration, and modality on postexercise oxygen consumption (VO2) and substrate selection/ respiratory-exchange ratio (RER) in healthy individuals. Three experiments (n = 7 for each) compared (a) short- (SD) vs. long-duration (LD) ergometer cycling exercise (30 min vs. 90 min) matched for intensity, (b) low- (LI) vs. high-intensity (HI) cycling (50% vs. 85% of VO2(max)) matched for energy expenditure, and (c) continuous (CON) vs. interval (INT) cycling matched for energy expenditure and mean intensity. All experiments were administered by crossover design. Altering exercise duration did not affect postexercise VO2 or RER kinetics (p > .05). However, RER was lower and fat oxidation was higher during the postexercise period in LD vs. SD (p < .05). HI vs. LI resulted in a significant increase in total postexercise energy expenditure and fat oxidation (p < .01). Altering exercise modality (CON vs. INT) did not affect postexercise VO2, RER, or fat oxidation (p > .05). These results demonstrate that postexercise energy expenditure and fat oxidation can be augmented by increasing exercise intensity, but these benefits cannot be exploited by undertaking interval exercise (1:2-min work:recovery ratio) when total energy expenditure, duration, and mean intensity remain unchanged. In spite of the apparent benefit of these strategies, the amount of fat oxidized after exercise may be inconsequential compared with that oxidized during the exercise bout. |
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Authors:
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Amy Warren; Erin J Howden; Andrew D Williams; James W Fell; Nathan A Johnson |
Publication Detail:
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Type: Journal Article; Randomized Controlled Trial |
Journal Detail:
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Title: International journal of sport nutrition and exercise metabolism Volume: 19 ISSN: 1526-484X ISO Abbreviation: Int J Sport Nutr Exerc Metab Publication Date: 2009 Dec |
Date Detail:
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Created Date: 2010-02-23 Completed Date: 2010-03-11 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100939812 Medline TA: Int J Sport Nutr Exerc Metab Country: United States |
Other Details:
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Languages: eng Pagination: 607-23 Citation Subset: IM |
Affiliation:
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School of Human Life Sciences, University of Tasmania, Launceston, Australia. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adipose Tissue
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metabolism Adult Bicycling / physiology* Carbohydrate Metabolism Cross-Over Studies Energy Metabolism / physiology* Female Humans Lipid Metabolism / physiology* Male Oxidation-Reduction Oxygen Consumption / physiology* Physical Exertion / physiology Time Factors Young Adult |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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