Document Detail


Glycogen depletion patterns during continuous and intermittent ice skating.
MedLine Citation:
PMID:  723508     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The glycogen depletion patterns in the vastus lateralis muscle were studied during ice skating using eight hockey players. For each subject, exercise consisted of either repeated bouts (10) of high intensity work (120% Vo2 max) or continuous work (60 min) of low intensity (55% Vo2 max). During continuous skating, glycogen showed a 29% decline (p less than 0.05) over the 60 min. In the intermittent condition, there was a two fold greater depletion (p less than 0.05) with the most rapid loss occurring during the first five, one min work bouts. Histochemical analysis by fiber type indicated that the most pronounced glycogen loss was from the Type I fibers during continuous skating whereas during the intermittent condition, a preferential loss occurred in the Type II fibers, most notably the Type IIB fibers. Measurements of muscle metabolites during continuous skating indicated no change for ATP from the rest condition at 30 or 60 min, a reduction (p less than 0.05) in CP (4.1 mmoles.kg-1) at 60 min and an elevation (p less than 0.05) in lactate (0.85 mmoles.kg-1) at 60 min. In the intermittent condition, reductions (p less than 0.05) in ATP (0.47 mmoles.kg-1) and CP (8.7 mmoles.kg-1) and elevations (p less than 0.05) in lactate (21.7 mmoles.kg-1) were found following 5 work bouts. Thereafter, no significant changes were observed. It is concluded that the glycogen depletion patterns and alteration in muscle metabolites are similar to those seen during cycling at similar percentages of Vo2 max.
Authors:
H J Green
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Medicine and science in sports     Volume:  10     ISSN:  0025-7990     ISO Abbreviation:  Med Sci Sports     Publication Date:  1978  
Date Detail:
Created Date:  1979-02-26     Completed Date:  1979-02-26     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0203246     Medline TA:  Med Sci Sports     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  183-7     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Adenosine Triphosphate / analysis
Adult
Glycogen / analysis,  metabolism*
Humans
Lactates / analysis
Muscles / analysis,  metabolism*
Oxygen Consumption
Phosphocreatine / analysis
Skating
Sports Medicine*
Chemical
Reg. No./Substance:
0/Lactates; 56-65-5/Adenosine Triphosphate; 67-07-2/Phosphocreatine; 9005-79-2/Glycogen

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


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