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Each of six male subjects was exposed during rest to at least ten different thermal environments (Ta, 22-44 degrees C; rh, 40%). Local sweat rates from both forearms were continuously recorded in a steady state of each exposure, using capacitance hygrometry. In the absence of spontaneous sweating, localized sweating was induced by intradermal administration(More)
Sweat secretion from individual sweat glands on the human sole was observed in four male subjects by using a videomicroscope and correlated with sudomotor neural activity recorded from the tibial nerve by means of microneurography. Individual sweat glands could be distinguished as active, less active and inactive according to the incidence of sweat(More)
In a warm environment at ambient temperatures between 25° and 38°C (relative humidity 50%–60%) the relationship between sympathetic activity in cutaneous nerves (SSA) and pulses of sweat expulsion was investigated in five young male subjects. The SSA was recorded from the peroneal nerve using a microelectrode. Sweat expulsion was identified on the sweat(More)
Physiological significance of vasoactive intestinal polypeptide (VIP), a putative co-transmitter of the cholinergic neuron innervating sweat glands, was investigated by its local effect on drug-induced sweating. VIP, methacholine chloride (MCH), or VIP plus MCH dissolved in 0.1 ml of 0.9% NaCl solution to a specified concentration was injected intradermally(More)
Skin sympathetic nerve activities (SSNAs) were recorded simultaneously from the tibial and peroneal nerves by microneurography at an ambient temperature of 25 degrees C in five subjects with primary palmoplantar hyperhidrosis. The resting of the tibial SSNA innervating the sole (glabrous skin) increased moderately (36.5 +/- 1.5 bursts/min), while mental(More)
We examined the effects of repeated artificial CO2 (1,000 ppm) bathing on tympanic temperature (T ty), cutaneous blood flow, and thermal sensation in six healthy males. Each subject was immersed in CO2-rich water at a temperature of 34°C up to the level of the diaphragm for 20 min. The CO2-rich water was prepared using a multi-layered composite hollow-fiber(More)
To investigate the effects of age on thermal sensitivity, preferred ambient temperature (Tpref) was compared between old (71-76 years) and young (21-30 years) groups, each consisting of six male subjects in summer and winter. The air temperature (Ta) was set at either 20 degrees C or 40 degrees C at commencement. The subject was directed to adjust the Ta(More)
We studied how facial fanning during hyperthermia improves the thermal comfort sensation. Experiments were carried out on ten male subjects. They were immersed in hot water at 40°C for 45 min. At 20 min and 35 min, fanning (1 m·s–1) was applied to their faces for 5 min. Core temperature (T c) measured as esophageal temperature (T es) and tympanic(More)
In summer and winter, young, sedentary male (N = 5) and female (N = 7) subjects were exposed to heat in a climate chamber in which ambient temperature (Ta) was raised continuously from 30 to 42°C at a rate of 0.1°C min(-1) at a relative humidity of 40%. Sweat rates (SR) were measured continuously on forearm, chest and forehead together with tympanic(More)