| Carbohydrate intake during prolonged cycling minimizes effect of glycemic index of preexercise meal. | |
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MedLine Citation:
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PMID: 9843546 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We studied the effects of the glycemic index (GI) of preexercise meals on metabolism and performance when carbohydrate (CHO) was ingested throughout exercise. Six well-trained cyclists performed three counterbalanced trials of 2-h cycling at approximately 70% of maximal oxygen uptake, followed by a performance ride of 300 kJ. Meals consumed 2 h before exercise consisted of 2 g CHO/kg body mass of either high-GI potato (HGI trial) or low-GI pasta (LGI trial), or of a low-energy jelly (Con trial). Immediately before and throughout exercise, subjects ingested a 10 g/100 ml [U-14C]glucose solution for a total of 24 ml/kg body mass. Despite differences in preexercise glucose, insulin, and free fatty acids concentrations among trials, both total CHO oxidation for HGI, LGI, and Con trials, respectively, during steady-state exercise [403 +/- 16, 376 +/- 29, and 373 +/- 24 (SE) g/2 h] and oxidation of the ingested CHO (65 +/- 6, 57 +/- 6, and 63 +/- 5 g/2 h) were similar. There was no difference in time to complete the subsequent performance ride (946 +/- 23, 954 +/- 35, and 970 +/- 26 s for HGI, LGI, and Con trials, respectively). When CHO is ingested during exercise in amounts presently recommended by sports nutrition guidelines, preexercise CHO intake has little effect on metabolism or on subsequent performance during prolonged cycling (approximately 2.5 h). |
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Authors:
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L M Burke; A Claassen; J A Hawley; T D Noakes |
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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: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 85 ISSN: 8750-7587 ISO Abbreviation: J. Appl. Physiol. Publication Date: 1998 Dec |
Date Detail:
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Created Date: 1999-02-01 Completed Date: 1999-02-01 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 2220-6 Citation Subset: IM |
Affiliation:
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Department of Sports Nutrition, Australian Institute of Sport, Bruce, Australian Capital Territory 2617, Australia. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Bicycling / physiology Blood Glucose / metabolism* Dietary Carbohydrates / administration & dosage* Exercise / physiology* Exercise Test Fatty Acids, Nonesterified / blood Humans Insulin / blood Male Nutritional Physiological Phenomena Physical Endurance / physiology Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Blood Glucose; 0/Dietary Carbohydrates; 0/Fatty Acids, Nonesterified; 11061-68-0/Insulin |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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