| Effect of a 1-hour single bout of moderate-intensity exercise on fat oxidation kinetics. | |
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MedLine Citation:
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PMID: 19632694 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The present study aimed to examine the effects of a prior 1-hour continuous exercise bout (CONT) at an intensity (Fat(max)) that elicits the maximal fat oxidation (MFO) on the fat oxidation kinetics during a subsequent submaximal incremental test (IncrC). Twenty moderately trained subjects (9 men and 11 women) performed a graded test on a treadmill (Incr), with 3-minute stages and 1-km.h(-1) increments. Fat oxidation was measured using indirect calorimetry and plotted as a function of exercise intensity. A mathematical model (SIN) including 3 independent variables (dilatation, symmetry, and translation) was used to characterize the shape of fat oxidation kinetics and to determine Fat(max) and MFO. On a second visit, the subjects performed CONT at Fat(max) followed by IncrC. After CONT performed at 57% +/- 3% (means +/- SE) maximal oxygen uptake (Vo(2max)), the respiratory exchange ratio during IncrC was lower at every stage compared with Incr (P < .05). Fat(max) (56.4% +/- 2.3% vs 51.5% +/- 2.4% Vo(2max), P = .013), MFO (0.50 +/- 0.03 vs 0.40 +/- 0.03 g.min(-1), P < .001), and fat oxidation rates from 35% to 70% Vo(2max) (P < .05) were significantly greater during IncrC compared with Incr. However, dilatation and translation were not significantly different (P > .05), whereas symmetry tended to be greater in IncrC (P = .096). This study showed that the prior 1-hour continuous moderate-intensity exercise bout increased Fat(max), MFO, and fat oxidation rates over a wide range of intensities during the postexercise incremental test. Moreover, the shape of the postexercise fat oxidation kinetics tended to have a rightward asymmetry. |
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Authors:
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Xavier Chenevière; Fabio Borrani; Vincent Ebenegger; Boris Gojanovic; Davide Malatesta |
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Publication Detail:
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Type: Journal Article Date: 2009-07-25 |
Journal Detail:
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Title: Metabolism: clinical and experimental Volume: 58 ISSN: 1532-8600 ISO Abbreviation: Metab. Clin. Exp. Publication Date: 2009 Dec |
Date Detail:
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Created Date: 2009-11-16 Completed Date: 2009-11-30 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0375267 Medline TA: Metabolism Country: United States |
Other Details:
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Languages: eng Pagination: 1778-86 Citation Subset: IM |
Affiliation:
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Institute of Sport Sciences and Physical Education, University of Lausanne, 1015 Lausanne, Switzerland. xavier.cheneviere@unil.ch |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Anaerobic Threshold / physiology Body Composition / physiology Calorimetry, Indirect Carbohydrate Metabolism / physiology Carbon Dioxide / blood Exercise / physiology* Exercise Test Female Heart Rate / physiology Humans Kinetics Lipid Metabolism / physiology* Male Middle Aged Mixed Function Oxygenases / metabolism Oxidation-Reduction Oxygen Consumption / physiology Vasodilation / physiology Young Adult |
| Chemical | |
Reg. No./Substance:
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124-38-9/Carbon Dioxide; EC 1.-/Mixed Function Oxygenases |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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