Document Detail

The induction and decay of heat acclimatisation in trained athletes.
MedLine Citation:
PMID:  1763248     Owner:  NLM     Status:  MEDLINE    
Heat acclimatisation/acclimation involves a complex of adaptations which includes decreased heart rate, rectal temperature, perceived exertion as well as increased plasma volume and sweat rate. These adaptations serve to reduce physiological strain, improve an athlete's ability to exercise in a hot environment, and reduce the incidence of some forms of heat illness. Few differences exist in the ability of men and women to acclimatise to heat. Typically, older runners do not perform in the heat as well as younger runners, but physical training can negate differences between these groups. Hormonal adaptations (e.g. aldosterone, vasopressin) during heat acclimatisation encourage fluid-electrolyte retention and cardiovascular stability. Athletes with high maximal aerobic power (VO2max) acclimatise to heat faster (and lose adaptations slower when they are inactive in a cool environment) than athletes with low VO2max values. Physical training in a cool environment improves physiological responses to exercise at high ambient temperatures. In attempting to optimise heat acclimatisation, athletes should maintain fluid-electrolyte balance, exercise at intensities greater than 50% VO2max for 10 to 14 days, and avoid factors (e.g. sleep loss, infectious disease) which are known to reduce heat tolerance. Once acclimatisation has been achieved, inactivity results in a decay of favourable adaptations, after only a few days or weeks.
L E Armstrong; C M Maresh
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Publication Detail:
Type:  Comparative Study; Journal Article; Review    
Journal Detail:
Title:  Sports medicine (Auckland, N.Z.)     Volume:  12     ISSN:  0112-1642     ISO Abbreviation:  Sports Med     Publication Date:  1991 Nov 
Date Detail:
Created Date:  1992-02-11     Completed Date:  1992-02-11     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8412297     Medline TA:  Sports Med     Country:  NEW ZEALAND    
Other Details:
Languages:  eng     Pagination:  302-12     Citation Subset:  IM    
Department of Sport, Leisure, and Exercise Sciences, University of Connecticut, Storrs.
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MeSH Terms
Adaptation, Physiological / physiology*
Heat Exhaustion / etiology,  physiopathology,  prevention & control
Hot Temperature* / adverse effects
Oxygen Consumption / physiology
Physical Fitness / physiology*
Risk Factors
Time Factors

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

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