Document Detail


Exercise in a hot environment: the skin circulation.
MedLine Citation:
PMID:  21029188     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
The combined metabolic and thermoregulatory demands of exercise in the heat place an exceptional burden on the circulation, more than can be met through cardiac output and blood flow redistribution. Blood flow to muscle is not reduced by heat stress in exercise and cardiac output is insufficient to meet competing demands from skin and muscle. Skin blood flow during exercise in the heat is limited in several ways. Dynamic exercise causes a cutaneous vasoconstriction at exercise onset through increased vasoconstrictor activity, both in cool and warm conditions. As exercise continues, internal temperature reaches a threshold for increased active vasodilator activity that is elevated by exercise, but reduced by high skin temperature. Beyond that threshold, skin blood flow is limited well below what would be achieved at rest with the same thermal drive through a limit to the active vasodilator system. This combination of restraints on cutaneous vasodilator function compromises temperature regulation. Internal temperature rises to levels that limit exercise through central thermal effects, rather than loss of blood pressure or a reduction in blood flow to active muscle.
Authors:
J M Johnson
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Scandinavian journal of medicine & science in sports     Volume:  20 Suppl 3     ISSN:  1600-0838     ISO Abbreviation:  Scand J Med Sci Sports     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-10-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9111504     Medline TA:  Scand J Med Sci Sports     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  29-39     Citation Subset:  IM    
Copyright Information:
© 2010 John Wiley & Sons A/S.
Affiliation:
Department of Physiology, University of Texas Health Science Center, San Antonio, Texas 78229, USA. johnson@uthscsa.edu
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