Document Detail


Carbohydrate-loading and exercise performance. An update.
MedLine Citation:
PMID:  9291549     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
This review suggests that there is little or no effect of elevating pre-exercise muscle glycogen contents above normal resting values on a single exhaustive bout of high-intensity exercise lasting less than 5 minutes. Nor is there any benefit of increasing starting muscle glycogen content on moderate-intensity running or cycling lasting 60 to 90 minutes. In such exercise substantial quantities of glycogen remain in the working muscles at the end of exercise. However, elevated starting muscle glycogen content will postpone fatigue by approximately equal to 20% in endurance events lasting more than 90 minutes. During this type of exercise, exhaustion usually coincides with critically low (25 mmol/kg wet weight) muscle glycogen contents, suggesting the supply of energy from glycogen utilisation cannot be replaced by an increased oxidation of blood glucose. Glycogen supercompensation may also improve endurance performance in which a set distance is covered as quickly as possible. In such exercise, high carbohydrate diets have been reported to improve performance by 2 to 3%.
Authors:
J A Hawley; E J Schabort; T D Noakes; S C Dennis
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Review    
Journal Detail:
Title:  Sports medicine (Auckland, N.Z.)     Volume:  24     ISSN:  0112-1642     ISO Abbreviation:  Sports Med     Publication Date:  1997 Aug 
Date Detail:
Created Date:  1997-10-23     Completed Date:  1997-10-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8412297     Medline TA:  Sports Med     Country:  NEW ZEALAND    
Other Details:
Languages:  eng     Pagination:  73-81     Citation Subset:  IM; S    
Affiliation:
Sports Science Institute of South Africa, Cape Town, South Africa. jhawley@sports.uct.ac.za
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MeSH Terms
Descriptor/Qualifier:
Dietary Carbohydrates / administration & dosage*
Exercise / physiology*
Glycogen / analysis,  metabolism*
Humans
Muscle, Skeletal / chemistry,  metabolism*
Physical Endurance / physiology*
Time Factors
Chemical
Reg. No./Substance:
0/Dietary Carbohydrates; 9005-79-2/Glycogen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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