Document Detail


Supercompensation of muscle glycogen in trained and untrained subjects.
MedLine Citation:
PMID:  3698159     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of this study was to determine whether or not trained athletes have the same capacity for supercompensation of muscle glycogen as untrained subjects. Muscle glycogen was measured in 4 highly trained cyclists and 4 untrained controls over a 6 day period of exercise and dietary manipulation. During the week prior to the investigation the trained group tapered their training load but maintained a high carbohydrate intake as they would in preparation for a major competition. Needle biopsies were taken from the vastus lateralis before and after exhaustive cycle ergometry at 73% VO2 max followed by several sprint intervals, after 3 days on a carbohydrate-restricted diet and after 2 and 3 days on a high carbohydrate diet. All food intake was quantified and plasma insulin and glucose were monitored daily. The mean initial glycogen concentration for the trained group was 115 mmol X kg-1 wet muscle weight and 92 mmol X kg-1 for the untrained group. Both groups showed similar post exercise depletion and recovery patterns when expressed as a % of their initial values. Following 3 days of high carbohydrate diet, the glycogen concentration for the trained cyclists reached 174 mmol X kg-1 or 152% of its initial value while the untrained-group reached 143 mmol X kg-1 or 155% of its initial value. It was concluded that a regimen of exhaustive exercise, followed by a period of carbohydrate restriction and a period of high carbohydrate intake, results in substantially higher muscle glycogen storage than can be achieved by a reduction in training in combination with high carbohydrate intake.(ABSTRACT TRUNCATED AT 250 WORDS)
Authors:
S Roedde; J D MacDougall; J R Sutton; H J Green
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Canadian journal of applied sport sciences. Journal canadien des sciences appliquées au sport     Volume:  11     ISSN:  0700-3978     ISO Abbreviation:  Can J Appl Sport Sci     Publication Date:  1986 Mar 
Date Detail:
Created Date:  1986-05-27     Completed Date:  1986-05-27     Revised Date:  2008-02-26    
Medline Journal Info:
Nlm Unique ID:  7801184     Medline TA:  Can J Appl Sport Sci     Country:  CANADA    
Other Details:
Languages:  eng     Pagination:  42-6     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Adult
Dietary Carbohydrates / administration & dosage
Glycogen / metabolism*
Humans
Male
Muscles / metabolism*
Physical Education and Training*
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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