Document Detail

Preexercise sugar feeding does not alter prolonged exercise muscle glycogen or protein catabolism.
MedLine Citation:
PMID:  9189306     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to determine the effects of type of preexercise sugar feedings (glucose [GLU] or fructose [FRU]) on muscle glycogen and protein catabolism during prolonged exercise in fed men. Seven men cycled to exhaustion on three different occasions at 70% VO2max, 45 min after ingestion (700 ml) of either a 0.476 mol.L.1 carbohydrate (CHO) solution or a sweetened placebo (PLA). With GLU, serum insulin was significantly increased prior to exercise. As a result, serum glucose was significantly lower at 15 and 30 min of exercise with GLU, but was similar to the other treatments thereafter. Time to fatigue was absolutely longer with the GLU feeding, and exercise muscle glycogen catabolism was absolutely lower during the FRU trial, but the observed differences did not attain statistical significance due to intersubject variability. Protein catabolism was similar for all treatments. These data indicate that a 60-g preexercise glucose or fructose feeding following CHO loading procedures has minimal effects on muscle glycogen or protein catabolism during prolonged exercise.
R S van Zant; P W Lemon
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Publication Detail:
Type:  Clinical Trial; Controlled Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Canadian journal of applied physiology = Revue canadienne de physiologie appliquée     Volume:  22     ISSN:  1066-7814     ISO Abbreviation:  Can J Appl Physiol     Publication Date:  1997 Jun 
Date Detail:
Created Date:  1997-08-07     Completed Date:  1997-08-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9306274     Medline TA:  Can J Appl Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  268-79     Citation Subset:  IM; S    
Department of Biological Sciences, Northern Arizona University, Flagstaff 86011-5640, USA.
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MeSH Terms
Biopsy, Needle
Blood Glucose / metabolism
Chromatography, Gas
Dietary Sucrose / administration & dosage*
Double-Blind Method
Exercise / physiology*
Exercise Test
Exercise Tolerance / physiology
Fructose / administration & dosage
Glucose / administration & dosage
Glycogen / metabolism*
Insulin / blood
Muscle Fatigue
Muscle Proteins / metabolism*
Muscle, Skeletal / metabolism*
Nitrogen / metabolism
Reg. No./Substance:
0/Blood Glucose; 0/Dietary Sucrose; 0/Muscle Proteins; 11061-68-0/Insulin; 30237-26-4/Fructose; 50-99-7/Glucose; 7727-37-9/Nitrogen; 9005-79-2/Glycogen

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