Authors: Tatsuro Amano Shunsaku Koga Yoshimitsu Inoue Takeshi Nishiyasu Narihiko Kondo
Publish Date: 2013/04/12
Volume: 113, Issue: 8, Pages: 2067-2075
Abstract
The purpose of this study was to compare sweating function in sprinters who have trained for several years with untrained subjects and trained endurance runners Two separate experiments were conducted Nine sprinters eight untrained men and nine distance runners dotVtexto 2 textmax 509 ± 14 382 ± 18 and 591 ± 12 mL/kg/min respectively P 005 were passively heated for 50 min Experiment 1 and ten sprinters 11 untrained men and nine distance runners similar dotVtexto 2 textmax levels compared with Experiment 1 in each group had their sweat gland capacity assessed based on acetylcholineinduced sweating rate SR Experiment 2 The slope of the mean nonglabrous SR plotted against change in mean body temperature during passive heating did not differ significantly between sprinters and untrained men 121 ± 010 and 097 ± 012 mg cm−2/min/°C respectively in contrast compared with untrained men distance runners exhibited a significantly greater slope 142 ± 011 mg cm−2/min/°C P 005 The mean body temperature threshold for SR was not significantly different among the groups Acetylcholineinduced SR did not differ significantly between sprinters and untrained men whereas distance runners showed a significantly higher induced SR compared with untrained men The sweating function was not improved in sprinters who have trained 2–3 h/day 5 days/week for at least 3 years compared with untrained men although the dotVtexto 2 textmax was markedly greater in sprinters Thus there is a case that daily training was not sufficient to improve sweating function in sprinters relative to those in distance runnersWe thank our volunteer subjects for participating in this study This study was partly supported by a GrantinAid for Scientific Research B no 19300221 23300231 and a Japan Society for the Promotion of Science JSPS Fellowship no 244185 from the Ministry of Education Culture Sports Science and Technology
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