| Carbohydrate supplementation and sex differences in fuel selection during exercise. | |
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MedLine Citation:
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PMID: 20019632 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: To compare the effects of a high-CHO diet (80% CHO) and glucose ingestion (2 g x kg(-1)) during exercise (120 min, 57% VO2max) on fuel selection in women taking (W+OC) or not (W-OC) oral contraceptives and in men (six in each group). METHODS: Substrate oxidation was measured using indirect respiratory calorimetry in combination with a tracer technique to compute the oxidation of exogenous (13C-glucose) and endogenous CHO. RESULTS: In the control situation (mixed diet with water ingestion during exercise), the percent contribution to the energy yield (%En) of CHO oxidation was higher in men than in women (62 vs 53 %En). The high-CHO diet and glucose ingestion during exercise separately increased the %En from CHO oxidation in both men (+12%) and women (+24%), and the sex difference observed in the control situation disappeared. However, the increase in the %En from total CHO oxidation observed when glucose was ingested during exercise and when combined with a high-CHO diet was larger in women than in men (+47 vs +17 %En). This was not attributable to a higher %En from exogenous glucose oxidation in women, for which no sex difference was observed (25 and 27 %En in men and women), but was attributable to a smaller decrease in endogenous glucose oxidation. No significant difference in fuel selection was observed between W+OC and W-OC. CONCLUSIONS: The increase in total CHO oxidation after the high-CHO diet was not different between sexes. Glucose ingestion during exercise, separately and combined to the high-CHO diet, had a greater effect in women than in men; this was mostly attributable to the smaller reduction in endogenous CHO oxidation. |
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Authors:
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Jonathan Tremblay; Francois Peronnet; Denis Massicotte; Carole Lavoie |
Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Medicine and science in sports and exercise Volume: 42 ISSN: 1530-0315 ISO Abbreviation: Med Sci Sports Exerc Publication Date: 2010 Jul |
Date Detail:
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Created Date: 2010-06-21 Completed Date: 2010-10-05 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8005433 Medline TA: Med Sci Sports Exerc Country: United States |
Other Details:
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Languages: eng Pagination: 1314-23 Citation Subset: IM; S |
Affiliation:
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Department of Kinesiology, University of Montreal, Montreal, Quebec, Canada. jonathan.tremblay@umontreal.ca |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Calorimetry, Indirect Carbohydrate Metabolism / physiology* Contraceptives, Oral, Sequential Exercise / physiology* Female Food Preferences Glucose / metabolism* Humans Male Oxygen Consumption Sex Factors Young Adult |
| Chemical | |
Reg. No./Substance:
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0/Contraceptives, Oral, Sequential; 50-99-7/Glucose |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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