Document Detail


Exercise and heat orthostatism and the effect of heat acclimation and physical fitness.
MedLine Citation:
PMID:  907595     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Twelve trained and 16 untrained young men were administered five orthostatic tests while leaning upright against a wall, for 20 min--before exercise; after 60 min of exercise at a load of 40 W; after 15 min of exercise at a load of 80 W; after a Vo2 max test, and after 3 h of exercise at a load of 40 W in heat (39.4 degrees C DB, 30.3 degrees C WB). Eight of the untrained subjects were retested in the five orthostatic tests after 8 d of heat acclimation. The number of fainters in the orthostatic tests administered before exercise, after exercise at 40 W and 80 W, and after exercise in heat, were 3, 4, 6, and 13, respectively. There were no fainting episodes after the Vo2 max tests. Orthostatic responses in the different conditions were partially related. The trained subjects showed substantially better responses than the untrained ones (10% vs. 25% of fainting episodes), and heat acclimation resulted in marked improvement in orthostatism (decrease to 5% faintings). The results show that Vo2 max and heat tolerance account for most of the variability which determines orthostatic tolerance.
Authors:
E Shvartz; A Meroz; A Magazanik; Y Shoenfeld; Y Shapiro
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Aviation, space, and environmental medicine     Volume:  48     ISSN:  0095-6562     ISO Abbreviation:  Aviat Space Environ Med     Publication Date:  1977 Sep 
Date Detail:
Created Date:  1977-11-25     Completed Date:  1977-11-25     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  7501714     Medline TA:  Aviat Space Environ Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  836-42     Citation Subset:  IM; S    
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MeSH Terms
Descriptor/Qualifier:
Acclimatization*
Blood Pressure
Body Temperature
Environment, Controlled
Heart Rate
Heating*
Humans
Male
Oxygen Consumption
Physical Exertion*
Posture*
Sweating

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


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