Document Detail

Muscle glycogen depletion patterns in fast twitch fibre subgroups of man during submaximal and supramaximal exercise.
MedLine Citation:
PMID:  571096     Owner:  NLM     Status:  MEDLINE    
Muscle glycogen depletion in ST, FTa and FTb fibres were studied in human subjects undergoing two distinctly different modes of bicycle exercise. Two hours of submaximal exercise (60% of VO2 max) produced a 77% decline in muscle glycogen concentration accompanied by only minor elevations in muscle and blood lactate levels whereas 10 one minute supramaximal work bouts resulted in a 52% decrease in total glycogen concentration and substantially elevated muscle and blood lactate contents. Moreover the patterns of glycogen depletion in the two conditions were also distinctly different. Based on the PAS staining intensity, glycogen was depleted the most in ST fibres and least in FTb fibres, during submaximal work. During supramaximal work FTb fibres were the lightest in PAS staining, with little loss of glycogen from ST fibres. In both situations the loss of glycogen in the FTa fibres was intermediate compared to the other two fibre types. These data support a selective recruitment of muscle fibres during work of different intensities, and further, suggest a physiological basis for the subgrouping of FT fibres in man.
J A Thomson; H J Green; M E Houston
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Pflügers Archiv : European journal of physiology     Volume:  379     ISSN:  0031-6768     ISO Abbreviation:  Pflugers Arch.     Publication Date:  1979 Feb 
Date Detail:
Created Date:  1979-06-26     Completed Date:  1979-06-26     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0154720     Medline TA:  Pflugers Arch     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  105-8     Citation Subset:  IM; S    
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MeSH Terms
Cell Count
Glycogen / metabolism*
Muscles / cytology,  metabolism*
Oxygen Consumption
Periodic Acid-Schiff Reaction
Physical Exertion*
Reg. No./Substance:

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