Sweat gland activity following thermal and cholinergic training JA Yaggie, T Niemi, MJ Buono Biol Sport 2005; 22(1):3-11 ICID: 891549
Article type: Original article
IC™ Value: 10.26
Abstract provided by Publisher
Heat acclimation is an important counter-mechanism to minimize heat distress. Acclimation can occur through several mechanisms including warm-water immersion. Iontophoresis of pilocarpine has been shown to cause an acute sweat response, but has not been studied to assess its sustaining effects. The purpose of this investigation was to compare the physiological responses of repeated exposure to local heat vs. cholinergic agents on sweat gland function. Ten healthy, males (25.54.3 yrs; 178.87.5 cm; 8510.5 kg) served as their own controls. Sweat gland training consisted of 2-weeks of treatment, including 7-days of repeated exposure to pilocarpine to the right upper extremity (RUE), followed by 7-days of localized heat acclimation training (43ºC moist heating packs) to the left upper extremity (LUE). Sweat rate (SR), sweat gland density (SGD), and sweat rate per gland (S/G) were determined following pilocarpine stimulation on day 1 (T1), day 7 (T2), and day 14 (T3) on the RUE and LUE. Baseline readings of SR (6.590.69 g•m2•min-1 and 6.170.67) and SGD (1183 glands/cm2 and 1132) for the RUE and LUE were not significantly different on day 1 (p>0.05). Following repeated pilocarpine iontophoresis, the RUE exhibited a 4% decrease in SGD (1143 glands/cm2) and a 50% reduction in SR (3.280.36 g•m2•min-1). Following heat acclimation the LUE showed an increase in SGD of 7% (1213 glands/cm2) and a 36% increase in sweat rate (SR=8.420.93 g•m2•min-1) (p<0.05). These data indicate that sweat glands are more productive following local heat acclimation and are less responsive following repeated exposure to cholinergic-agonists.