Document Detail

Muscle glycogen repletion from endogenous carbon sources during recovery from high intensity exercise in the fasted rat.
MedLine Citation:
PMID:  8869725     Owner:  NLM     Status:  MEDLINE    
During recovery from high intensity exercise, substantial and rapid muscle glycogen repletion from endogenous carbon sources is reported in a variety of vertebrate species, the rat being the only reported exception. The major aim of this study was to re-examine the process of glycogen repletion during recovery from high intensity exercise in the rat. In response to 3 min of vigorous swimming, muscle glycogen concentrations decrease markedly from initial levels of 20.2 +/- 1.5 and 21.2 +/- 0.9 mumol g-1 to 6.4 +/- 1.1 and 7.9 +/- 1.4 mumol g-1 in the tibialis anterior and plantaris muscles respectively. The equivalent of 58% of the glycogen carbons mobilized during exercise by the plantaris and 73% of that mobilized by the tibialis anterior muscle is repleted within 1 h following exercise. Using the hepatectomized rat as experimental model, a secondary aim of the study was to evaluate whether the liver is essential for the repletion of muscle glycogen. Although the absence of significant differences in the magnitude of post-exercise muscle glycogen repletion between sham-operated and hepatectomized rats suggests that the resynthesis of muscle glycogen can take place in the absence of hepatic gluconeogenesis, the present study identifies several limitations in the use of acute hepatectomy. Overall, the present study indicates that, in contrast to published views, the rat resembles other vertebrates in that it can support extensive muscle glycogen repletion from endogenous carbon sources during the recovery phase following high intensity exercise.
S Nikolovski; D L Faulkner; T N Palmer; P A Fournier
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Acta physiologica Scandinavica     Volume:  157     ISSN:  0001-6772     ISO Abbreviation:  Acta Physiol. Scand.     Publication Date:  1996 Aug 
Date Detail:
Created Date:  1997-01-23     Completed Date:  1997-01-23     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0370362     Medline TA:  Acta Physiol Scand     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  427-34     Citation Subset:  IM; S    
Department of Biochemistry, University of Western Australia, Nedlands, Australia.
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MeSH Terms
Carbon / metabolism
Glycogen / metabolism*
Liver / metabolism
Liver Glycogen / metabolism
Muscles / metabolism*
Physical Exertion / physiology*
Rats, Wistar
Swimming / physiology
Reg. No./Substance:
0/Liver Glycogen; 7440-44-0/Carbon; 9005-79-2/Glycogen

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