Document Detail

A communicational link between skeletal muscle, brain, and cells of the immune system.
MedLine Citation:
PMID:  2193890     Owner:  NLM     Status:  MEDLINE    
The present paper reviews evidence for the role of specific amino acids in the etiology of fatigue and the overtraining syndrome in athletes. An increase in the plasma concentration ratio of free tryptophan: branched-chain amino acids may mediate an increase in 5-HT synthesis in the brain and thus induce fatigue during exercise. Glutamine is essential for the proper functioning of cells of the immune system and a decrease in plasma glutamine concentration post-exercise and in overtraining may induce an impairment in immune function. Branched-chain amino acids may play a central role in both these processes. Thus, they compete with free tryptophan for entry into the brain. Branched-chain amino acids may also be important precursors of nitrogen for the synthesis of glutamine in skeletal muscle or important in the control of glutamine release from muscle. Consequently, the metabolism of glutamine, tryptophan, and branched-chain amino acids may be the key to understanding some aspects of central fatigue and some aspects of immunosuppression that are very relevant to athletic endeavor. They may be also relevant to other physiological and pathological conditions.
M Parry-Billings; E Blomstrand; N McAndrew; E A Newsholme
Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  International journal of sports medicine     Volume:  11 Suppl 2     ISSN:  0172-4622     ISO Abbreviation:  Int J Sports Med     Publication Date:  1990 May 
Date Detail:
Created Date:  1990-08-08     Completed Date:  1990-08-08     Revised Date:  2005-11-16    
Medline Journal Info:
Nlm Unique ID:  8008349     Medline TA:  Int J Sports Med     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  S122-8     Citation Subset:  IM; S    
Department of Biochemistry, University of Oxford.
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MeSH Terms
Brain / metabolism*
Exercise / physiology
Fatigue / etiology*
Glutamine / deficiency,  metabolism*
Immune System / immunology,  physiology
Lymphocytes / immunology,  metabolism*
Macrophages / immunology,  metabolism*
Muscle Contraction
Muscles / metabolism*
Physical Endurance / physiology
Tryptophan / metabolism*
Reg. No./Substance:
56-85-9/Glutamine; 73-22-3/Tryptophan

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

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