| Dietary composition influences short-term endurance training-induced adaptations of substrate partitioning during exercise. | |
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MedLine Citation:
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PMID: 15129929 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The purpose of the current study was to examine the influence of dietary composition on short-term endurance training-induced adaptations of substrate partitioning and time trial exercise performance. Eight untrained males cycled for 90 min at approximately 54% aerobic capacity while being infused with [6,6(2)H]glucose before and after two 10-d experimental phases separated by a 2-week washout period. Time trial performance was measured after the 90-min exercise trials before and after the 2nd experimental phase. During the first 10-d phase, subjects were randomly assigned to consume either a high carbohydrate or high fat diet while remaining inactive (CHO or FAT). During the second 10-d phase, subjects consumed the opposite diet, and both groups performed identical daily supervised endurance training (CHO+T or FAT+T). CHO and CHO+T did not affect exercise metabolism. FAT reduced glucose flux at the end of exercise, while FAT+T substantially increased whole body lipid oxidation during exercise and reduced glucose flux at the end of exercise. Despite these differences in adaptation of substrate use, training resulted in similar improvements in time trial performance for both groups. We conclude that (a) 10-d high fat diets result in substantial increases in whole body lipid oxidation during exercise when combined with daily aerobic training, and (b) diet does not affect short-term training-induced improvements in high-intensity time trial performance. |
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Authors:
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Kevin A Jacobs; David R Paul; Ray J Geor; Kenneth W Hinchcliff; W Michael Sherman |
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Publication Detail:
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Type: Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: International journal of sport nutrition and exercise metabolism Volume: 14 ISSN: 1526-484X ISO Abbreviation: Int J Sport Nutr Exerc Metab Publication Date: 2004 Feb |
Date Detail:
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Created Date: 2004-05-07 Completed Date: 2004-06-10 Revised Date: 2006-11-15 |
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: 38-61 Citation Subset: IM |
Affiliation:
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School of Physical Activity and Education Services, Ohio State University, Columbus, OH 43210, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adaptation, Physiological* Adult Bicycling / physiology Blood Glucose / analysis Cross-Over Studies Diet* Dietary Carbohydrates / administration & dosage*, metabolism Dietary Fats / administration & dosage*, metabolism Exercise Test Humans Male Oxidation-Reduction Oxygen Consumption Physical Endurance / drug effects, physiology* |
| Chemical | |
Reg. No./Substance:
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0/Blood Glucose; 0/Dietary Carbohydrates; 0/Dietary Fats |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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