Individual Variability in the Peripheral and Core Interthreshold Zones(ICPA 2006)

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概要

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• The purpose of the study was to investigate the degree of subject variability in the peripheral and core temperature thresholds of the onset of shivering and sweating. Nine healthy young male subjects participated in three trials. In the first two trials, wearing only shorts, they were exposed to air temperatures of 5℃ and 40℃ until the onset of shivering and sweating, respectively. In the second experiment, subjects wore a water per fused suit that was per fused with 25℃ water at a rate of 600cc/min. They exercised on an ergometer at 50% of their maximum work rate for 10-15min. At the onset of sweating, the exercise was terminated, and they remained seated until the onset of shivering, as reflected in oxygen uptake. In the first two trials, rectal temperature (Tre) was stable, despite displacements in skin temperature (Tsk), whereas in the third trial, Tsk (measured at four sites) was almost constant (30-32℃), and the thermoregulatory responses were initiated due to changes in Tre alone. The results of the first two trials established the peripheral interthreshold zone, whereas the results of the third trial established the core interthreshold zone. The results demonstrated individual variability in the peripheral and core interthreshold zones, a proportional correlation between both zones (r=0.87), and a relatively higher contribution of adiposity in both zones as compared with those of other non-thermal factors such as height, weight, body surface area, surface area-to mass ratio, and the maximum work load.

• 日本生理人類学会の論文

著者

• Katsuura Tetsuo

  Graduate School of Engineering, Chiba University

• Mekjavic Igor

  Jozef Stefan Institute

• Katsuura Tetsuo

  Graduate School Of Engineering Chiba University

• Kakitsuba Naoshi

  Dept. of Arch., Toyota Collage of Tech.

• Kakitsuba Naoshi

  Department Of Environment And Technology School Of Science And Technology Meijo University

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