P-8 Sweat Gland Function in Thai and Japanese Males in Relation to Physical Training

To examine the effects of long and short-term heat acclimation on peripheral sweating mechanisms, we compared an axon reflex-mediated (AXR) sweating and directly activated (DIR) sweating responses on the forearm and thigh to iontophoretically applied acetylcholine in 16 physically trained Thai (Thai...

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Bibliographic Details
Published in:Journal of PHYSIOLOGICAL ANTHROPOLOGY 2008, Vol.27 (2), p.107-108
Main Authors: Hiroyuki UEDA, Chucheep PRAPUTPITTAYA, Tharaporn SUTABHAHA, Toyoshi KUBOTA, Sara AKITA, Takaaki MATSUMOTO, Yoshimitsu INOUE
Format: Article
Language:Japanese
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Summary:To examine the effects of long and short-term heat acclimation on peripheral sweating mechanisms, we compared an axon reflex-mediated (AXR) sweating and directly activated (DIR) sweating responses on the forearm and thigh to iontophoretically applied acetylcholine in 16 physically trained Thai (Thai-T) and 14 Japanese males (Jpn-T) and 15 untrained Thai (Thai-U) and 13 Japanese (Jpn-U) males. The AXR sweating was higher in Jpn-T than Thai-T and in Jpn-U than Thai-U, and also each T group than the corresponding U group respectively, especially on the thigh. The sweat rate of DIR (DIRSR) was significantly higher in Jap-T than Jap-U and Thai-T than Thai-U and in Jap-T than Thai-T. The effects of long and short-term heat acclimation on the DIRSR were due to the sweat gland output rather than number of activated sweat glands. Our results suggest that AXR and DIR sweating can be suppressed by long-term heat acclimation and can be enhanced by short-term heat acclimation (by physical training). Regional differences exist in the modification by both short- and long-term heat acclimations.
ISSN:1880-6791