AJP - Regu AJP: Heart and Circulatory Physiology
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH
 QUICK SEARCH:   [advanced]


     


Am J Physiol Regul Integr Comp Physiol (October 24, 2003). doi:10.1152/ajpregu.00359.2003
This Article
Right arrow Full Text (PDF)
Right arrow All Versions of this Article:
286/3/R512    most recent
00359.2003v1
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Patterson, M. J.
Right arrow Articles by Taylor, N. A.S.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Patterson, M. J.
Right arrow Articles by Taylor, N. A.S.
Submitted on July 2, 2003
Accepted on October 20, 2003

Humid heat acclimation does not elicit a preferential sweat redistribution towards the limbs

Mark J. Patterson1*, Jodie M. Stocks1, and Nigel A.S. Taylor1

1 Department of Biomedical Science, University of Wollongong, Wollongong, NSW, Australia

* To whom correspondence should be addressed. E-mail: mark.patterson{at}dsto.defence.gov.au.

We tested the hypothesis that local sweat rates would not display a systematic, post-adaptation redistribution towards the limbs following humid-heat acclimation. Eleven non-adapted males were acclimated over three weeks (16 exposures), cycling 90 min per day, six days a week (40°C, 60% relative humidity), using the controlled-hyperthermia acclimation technique, in which work rate was modified to achieve and maintain a target core temperature (38.5°C). Local sudomotor adaptation (forehead, chest, scapula, forearm, thigh) and onset thresholds were studied during constant work intensity heat stress tests (39.8°C, 59.2% relative humidity) conducted on day 1, 8 and 22 of acclimation. The mean body temperature (Tb) at which sweating commenced (threshold) was reduced on days 8 and 22 (P<0.05), and these displacements paralleled the resting thermoneutral Tb shift, such that the Tb change to elicit sweating remained constant from days 1 to 22. Whole-body sweat rate increased significantly from 0.87 ±0.06 l.h-1, on day 1, to 1.09 ±0.08 and 1.16 ±0.11 l.h-1 on days 8 and 22, respectively. However, not all skin regions exhibited equivalent relative sweat rate elevations from day 1 to 22. The relative increase in forearm sweat rate (117 ±31%) exceeded that at the forehead (47 ±18%; P<0.05) and thigh (42 ±16%; P<0.05), while the chest sweat rate elevation (106 ±29%) also exceeded the thigh (P<0.05). Two unique, post-acclimation observations arose from this project. First, reduced sweat thresholds appeared to be primarily related to a lower resting Tb, and more dependent on Tb change. Second, our data did not support the hypothesis of a generalised and preferential trunk-to-limb sweat redistribution following heat acclimation.




This article has been cited by other articles:


Home page
Br. J. Sports. Med.Home page
C Sunderland, J G Morris, and M E Nevill
A heat acclimation protocol for team sports
Br. J. Sports Med., May 1, 2008; 42(5): 327 - 333.
[Abstract] [Full Text] [PDF]




HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH
Visit Other APS Journals Online
Copyright © 2003 by the American Physiological Society.