| Gender differences in whole-body fat oxidation kinetics during exercise. | |
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MedLine Citation:
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PMID: 21326382 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Discrepancies appear in studies comparing fat oxidation between men and women. Therefore, this study aimed to quantitatively describe and compare whole-body fat oxidation kinetics between genders during exercise, using a sinusoidal (SIN) model. Twelve men and 11 women matched for age, body mass index, and aerobic fitness (maximal oxygen uptake and maximal power output per kilogram of fat-free mass (FFM)) performed submaximal incremental tests (Incr) with 5-min stages and a 7.5% maximal power output increment on a cycle ergometer. Fat oxidation rates were determined using indirect calorimetry, and plotted as a function of exercise intensity. The SIN model, which includes 3 independent variables (dilatation, symmetry, translation) that account for the main quantitative characteristics of kinetics, was used to mathematically describe fat oxidation kinetics and to determine the intensity (Fatmax) eliciting the maximal fat oxidation (MFO). During Incr, women exhibited greater fat oxidation rates from 35% to 85% maximal oxygen uptake, MFO (6.6 ± 0.9 vs. 4.5 ± 0.3 mg·kg FFM-1·min-1), and Fatmax (58.1% ± 1.9% vs. 50.0% ± 2.7% maximal oxygen uptake) than men (p < 0.05). While men and women showed similar global shapes of fat oxidation kinetics in terms of dilatation and symmetry (p > 0.05), the fat oxidation curve tended to be shifted toward higher exercise intensities in women (rightward translation, p = 0.08). These results support the idea that women have a greater reliance on fat oxidation than men during submaximal exercise, but also indicate that this greater fat oxidation is shifted toward higher exercise intensities in women than in men. |
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Authors:
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Xavier Chenevière; Fabio Borrani; David Sangsue; Boris Gojanovic; Davide Malatesta |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Applied physiology, nutrition, and metabolism = Physiologie appliquée, nutrition et métabolisme Volume: 36 ISSN: 1715-5312 ISO Abbreviation: Appl Physiol Nutr Metab Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-02-17 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101264333 Medline TA: Appl Physiol Nutr Metab Country: Canada |
Other Details:
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Languages: eng Pagination: 88-95 Citation Subset: IM |
Affiliation:
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Institute of Sport Sciences (ISSUL), Department of Physiology, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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