Document Detail

Carbohydrate nutrition before, during, and after exercise.
MedLine Citation:
PMID:  3967778     Owner:  NLM     Status:  MEDLINE    
The role of dietary carbohydrates (CHO) in the resynthesis of muscle and liver glycogen after prolonged, exhaustive exercise has been clearly demonstrated. The mechanisms responsible for optimal glycogen storage are linked to the activation of glycogen synthetase by depletion of glycogen and the subsequent intake of CHO. Although diets rich in CHO may increase the muscle glycogen stores and enhance endurance exercise performance when consumed in the days before the activity, they also increase the rate of CHO oxidation and the use of muscle glycogen. When consumed in the last hour before exercise, the insulin stimulated-uptake of glucose from blood often results in hypoglycemia, greater dependence on muscle glycogen, and an earlier onset of exhaustion than when no CHO is fed. Ingesting CHO during exercise appears to be of minimal value to performance except in events lasting 2 h or longer. The form of CHO (i.e., glucose, fructose, sucrose) ingested may produce different blood glucose and insulin responses, but the rate of muscle glycogen resynthesis is about the same regardless of the structure.
D L Costill
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Federation proceedings     Volume:  44     ISSN:  0014-9446     ISO Abbreviation:  Fed. Proc.     Publication Date:  1985 Feb 
Date Detail:
Created Date:  1985-03-18     Completed Date:  1985-03-18     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0372771     Medline TA:  Fed Proc     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  364-8     Citation Subset:  IM; S    
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MeSH Terms
Blood Glucose / metabolism
Dietary Carbohydrates / administration & dosage*,  metabolism
Fatigue / metabolism
Glycogen / metabolism
Liver / metabolism
Liver Glycogen / metabolism
Muscles / metabolism
Physical Endurance
Physical Exertion*
Time Factors
Reg. No./Substance:
0/Blood Glucose; 0/Dietary Carbohydrates; 0/Liver Glycogen; 9005-79-2/Glycogen

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

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