Document Detail


Decay of heat acclimation during exercise in cold and exposure to cold environment.
MedLine Citation:
PMID:  16151840     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Sixteen male students exercised for 14 days (1 h/day) in the heat for heat acclimation (HA). During deacclimation (DA) one group exercised in the cold (EXG, n=8) for 60 min/day (morning) and was exposed to the cold for another hour (afternoon) for 14 days. The other group was exposed to the cold (EPG, n=8) for 1 h each in the morning and afternoon (Ta: 18.0 degrees C, RH: 58%) over the same period. All returned to exercise in the heat for reacclimation (RA) for 10 days. Subjects were tested on days 1, 16, 21, 32, 36 and 44 on a bicycle ergometer for 60 min at 60% of VO(2max) in the heat (Ta: 31.1 degrees C, RH: 70%). Rectal temperature (T (re)) and heart rate (HR) at 40 min of exercise were used to determine the decay/gain of HA, which was calculated using the formula described by Pandolf et al. (Ergonomics, 20:399-408, 1977). After HA (day 16) T (re) and HR decreased significantly. During DA, EXG showed decay in T (re) of 24 and 35% and HR of 29 and 35% on days 21 and 32, respectively. For EPG the corresponding decay was of 2 and 9% for T (re) and 17 and 17% for HR. After 10 days of RA, EXG showed gains of 11% in T (re) and 12% in HR, while EPG showed gains of 47% in T (re) and 38% in HR. In conclusion, EXG had greater decay during DA and lower gains in RA compared to EPG. However, the differences between groups were significant only for T (re) after 4 days of DA.
Authors:
M Saat; R G Sirisinghe; R Singh; Y Tochihara
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-10-27
Journal Detail:
Title:  European journal of applied physiology     Volume:  95     ISSN:  1439-6319     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2005 Oct 
Date Detail:
Created Date:  2005-10-27     Completed Date:  2006-04-10     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  313-20     Citation Subset:  IM    
Affiliation:
Department of Physiology, School of Medical Sciences, Universiti Sains Malaysia, 16150 KB, Kelantan, Malaysia. matsaat@kb.usm.my
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MeSH Terms
Descriptor/Qualifier:
Acclimatization*
Adolescent
Adult
Body Temperature Regulation / physiology*
Cold Temperature
Dehydration
Exercise / physiology*
Hot Temperature*
Humans
Lactase / blood*
Male
Physical Exertion*
Research Design
Chemical
Reg. No./Substance:
EC 3.2.1.108/Lactase

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


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