Document Detail

Muscle glycogen storage following prolonged exercise: effect of timing of ingestion of high glycemic index food.
MedLine Citation:
PMID:  9044226     Owner:  NLM     Status:  MEDLINE    
This study examined the effect of delaying the ingestion of carbohydrate on muscle glycogen storage following prolonged exhaustive exercise. Six endurance trained men cycled on two separate occasions at a workload corresponding to 70% VO2max for 2 h followed by four "all-out" 30-s sprints. Following exercise, subjects were fed five high glycemic index (HGI) meals over a 24-h period, with the first three being fed either at 0-4 h (IT) or 2-6 h (DT) at 2-h intervals. Muscle biopsies were taken immediately after exercise and at 8 and 24 h post-exercise and analyzed for glycogen and glucose-6-phosphate. Blood samples were obtained prior to and at 30, 60, and 90 min after each meal and analyzed for glucose and insulin. No differences were observed in the incremental glucose and insulin areas after each meal when IT and DT were compared. In addition, no differences were observed in muscle glycogen or glucose-6-phosphate any time in the two trials. These data indicate that delayed feeding of a HGI meal by 2 h has no effect on the rate of muscle glycogen resynthesis at 8 and 24 h post-exercise, providing that sufficient carbohydrate is ingested during the recovery period.
J A Parkin; M F Carey; I K Martin; L Stojanovska; M A Febbraio
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  29     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  1997 Feb 
Date Detail:
Created Date:  1997-04-30     Completed Date:  1997-04-30     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  220-4     Citation Subset:  IM; S    
Exercise Metabolism Unit, Victoria University of Technology, Footscray, Australia.
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MeSH Terms
Dietary Carbohydrates / administration & dosage*
Exercise / physiology*
Glycogen / metabolism*
Muscle Fibers, Fast-Twitch / physiology*
Muscle Fibers, Slow-Twitch / physiology*
Oxygen Consumption
Physical Endurance / physiology*
Time Factors
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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