Affiliation:
1. Center for Research and Education in Special Environments, Department of Exercise and Nutrition Sciences, University at Buffalo, Buffalo, New York
Abstract
The recruitment of thermoeffectors, including thermoregulatory behavior, relative to changes in body temperature has not been quantified in humans. We tested the hypothesis that changes in skin blood flow, behavior, and sweating or metabolic rate are initiated with increasing changes in mean skin temperature (Tskin) in resting humans. While wearing a water-perfused suit, 12 healthy young adults underwent heat (Heat) and cold stress (Cold) that induced gradual changes in Tskin. Subjects controlled the temperature of their dorsal neck to their perceived thermal comfort. Thus neck skin temperature provided an index of thermoregulatory behavior. Neck skin temperature (Tskin), core temperature (Tcore), metabolic rate, sweat rate, and nonglabrous skin blood flow were measured continually. Data were analyzed using segmental regression analysis, providing an index of thermoeffector activation relative to changes in Tskin. In Heat, increases in skin blood flow were observed with the smallest elevations in Tskin ( P < 0.01). Thermal behavior was initiated with an increase in Tskin of 2.4 ± 1.3°C (mean ± SD, P = 0.04), while sweating was observed with further elevations in Tskin (3.4 ± 0.5°C, P = 0.04), which coincided with increases in Tcore ( P = 0.98). In Cold, reductions in skin blood flow occurred with the smallest decrease in Tskin ( P < 0.01). Thermal behavior was initiated with a Tskin decrease of 1.5 ± 1.3°C, while metabolic rate ( P = 0.10) and Tcore ( P = 0.76) did not change throughout. These data indicate that autonomic and behavioral thermoeffectors are recruited in coordination with one another and likely in an orderly manner relative to the comparative physiological cost.
Publisher
American Physiological Society
Subject
Physiology (medical),Physiology
Cited by
29 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献