Longitudinal analysis of the sweating response of pre-, mid-, and late-pubertal boys during exercise in the heat

American Journal of Human Biology : the Official Journal of the Human Biology Council
B FalkL McGillis

Abstract

The thermoregulatory response to exercise in the heat, especially sweating pattern, differs between children and adults. This study investigated the changes with physical maturation in the thermoregulatory response to exercise (50% V̇O2 max) in the heat (42°C 20% RH) among circum-pubertal boys, using a mixed cross-sectional, longitudinal design. Subjects were initially divided into three groups, based on Tanner (pubic hair) criteria: 16 pre-pubertal (PP, stage I), 15 mid-pubertal (MP, stages II, III, IV), and 5 late-pubertal (LP, stage V). The thermoregulatory response was observed every 6 months for a period of 18 months (4 sessions). Thirty of the 36 boys completed the four sessions. During each session, the exercise task consisted of three 20-min bouts of cycling with 10-min rest periods. Measurements included rectal and skin temperatures and heart rate continuously, V̇O2 at the midpoint of the second bout, sweat collection during each bout, photography of sweat drops after bouts 1 and 2, and whole body sweating rate. During each session, body temperatures tended to be higher among LP relative to the other two groups; however, the rate of increase in body temperatures was similar among groups. Sweating rate per body surface ...Continue Reading

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Citations

Nov 25, 2014·The British Journal of Nutrition·Stephanie BaronGerard Friedlander
Aug 12, 2000·Stress : the International Journal on the Biology of Stress·M J SchaafE Vreugdenhil
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