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Partial Acclimation to the Heat and Sweating Pattern in Prepubertal Boys

Wilk, B. (Children's Exercise and Nutrition Centre, McMaster University, Canada)
Bar-Or, O. (Children's Exercise and Nutrition Centre, McMaster University, Canada)

Contact Person: Boguslaw Wilk (wilkb@fhs.mcmaster.ca)


This study intended to determine whether acclimation to the heat among 9- to 12-year-old boys would induced changes in total and local sweating rate (SR), population density (PD) of heat-activated sweat gland, sweat drop area (DA) and % skin covered by sweat (%A). Twelve boys performed 180-min intermittent exercise (50% VO2 max) at 351oC, 50-60% RH, before and after a two-week heat acclimation (six 70-min sessions). Forearm and the lower back PD, DA and %A were assessed at rest, 15 min before the end of the session, using time-lapse photographic method with computer-assisted digitization. Local SR was estimated based on %A changes. Acclimation caused insignificant changes in PD (-5.1%), DA (-10.7%), %A (-1.3%) at the back and PD (+12.9%), DA (-7.2%), %A (+4.7%) at the forearm. Forearm and back estimated SR insignificantly decreased over acclimation period from 621 to 489 g.m2.h-1 (21.2%) and from 370 to 311 g.m2.h-1 (15.9%) respectively. Average total SR for the session was similar before (201 g.m2.h-1) and after (199 g.m2.h-1) acclimation. However, SR calculated for exercise periods was significantly higher (244 vs 280 g.m2.h-1, p < 0.05) and for rest periods significantly lower (166 vs 134 g.m2.h-1, p < 0.05) after acclimation. In conclusion, the above acclimation program induced only minor changes in sweating pattern of prepubescent boys. Supported in part by Gatorade Sports Science Institute

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Poster Number PAwilk0618
Keywords: children, acclimation, sweating, exercise, rest

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Wilk, B.; Bar-Or, O.; (1998). Partial Acclimation to the Heat and Sweating Pattern in Prepubertal Boys. Presented at INABIS '98 - 5th Internet World Congress on Biomedical Sciences at McMaster University, Canada, Dec 7-16th. Available at URL http://www.mcmaster.ca/inabis98/medicine/wilk0618/index.html
© 1998 Author(s) Hold Copyright