Document Detail


Muscle glycogen storage after different amounts of carbohydrate ingestion.
MedLine Citation:
PMID:  3145274     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of this study was to determine whether the rate of muscle glycogen storage could be enhanced during the initial 4-h period postexercise by substantially increasing the amount of the carbohydrate consumed. Eight subjects cycled for 2 h on three separate occasions to deplete their muscle glycogen stores. Immediately and 2 h after exercise they consumed either 0 (P), 1.5 (L), or 3.0 g glucose/kg body wt (H) from a 50% glucose polymer solution. Blood samples were drawn from an antecubital vein before exercise, during exercise, and throughout recovery. Muscle biopsies were taken from the vastus lateralis immediately, 2 h, and 4 h after exercise. Blood glucose and insulin declined significantly during exercise in each of the three treatments. They remained below the preexercise concentrations during recovery in the P treatment but increased significantly above the preexercise concentrations during the L and H treatments. By the end of the 4 h-recovery period, blood glucose and insulin were still significantly above the preexercise concentrations in both treatments. Muscle glycogen storage was significantly increased above the basal rate (P, 0.5 mumol.g wet wt-1.h-1) after ingestion of either glucose polymer supplement. The rates of muscle glycogen storage, however, were not different between the L and H treatments during the first 2 h (L, 5.2 +/- 0.9 vs. H, 5.8 +/- 0.7 mumol.g wet wt-1.h-1) or the second 2 h of recovery (L, 4.0 +/- 0.9 vs. H, 4.5 +/- 0.6 mumol.g wet wt-1. h-1).(ABSTRACT TRUNCATED AT 250 WORDS)
Authors:
J L Ivy; M C Lee; J T Brozinick; M J Reed
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  65     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1988 Nov 
Date Detail:
Created Date:  1989-02-16     Completed Date:  1989-02-16     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2018-23     Citation Subset:  IM; S    
Affiliation:
Department of Kinesiology and Health Education, University of Texas, Austin 78712.
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MeSH Terms
Descriptor/Qualifier:
Blood Glucose / metabolism
Dietary Carbohydrates / administration & dosage*,  metabolism
Glycogen / metabolism*
Glycogen Synthase / metabolism
Humans
Insulin / blood
Lactates / blood
Lactic Acid
Male
Muscles / metabolism*
Physical Exertion*
Pulmonary Gas Exchange
Chemical
Reg. No./Substance:
0/Blood Glucose; 0/Dietary Carbohydrates; 0/Insulin; 0/Lactates; 50-21-5/Lactic Acid; 9005-79-2/Glycogen; EC 2.4.1.11/Glycogen Synthase

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