DocumentCode :
259456
Title :
Determination of the Optimum Muscle Temperature for Maintaining Work Performance with Attenuation of Heat Stress in Human
Author :
Inoue, Ken ; Yoshida, Takafumi ; Kume, Masashi
Author_Institution :
Kyoto Inst. of Technol., Kyoto, Japan
fYear :
2014
fDate :
Aug. 31 2014-Sept. 4 2014
Firstpage :
795
Lastpage :
800
Abstract :
The purpose of this study was to investigate the optimum muscle temperature required to maintain work performance with attenuation of heat stress. Nine male subjects (23±0.36 year) performed eight 8-sec bouts of maximal cycling exercise at a load intensity of 60% of their peak power output, with a 40-sec resting period between bouts, in a room maintained at 24.8±0.2°C and 52±1% relative humidity. The subjects worn trousers lined with tubes perfused water at 6°C, 17°C, 30°C or 44°C, and the target thigh muscle temperatures were 32°C (32.4±0.2°C), 34°C (34.4±0.2°C), 36°C (36.3±0.1°C) and 38°C (37.5±0.2°C), respectively. The peak power output from first to fourth bouts and the total work output during eight bouts were significantly greater at the 36°C and 38°C conditions than at the 32°C and 34°C conditions (p<;0.01), while there were no remarkable differences between the 36°C and 38°C conditions. After 10 minutes of the eight bouts of exercise, the tympanic temperature (Tty) was significantly elevated at the 38°C condition, but fell at the 32°C and 34°C conditions compared to that at baseline (p <; 0.01), while the Tty remained constant at the 36°C condition. The heart rate and rating of perceived exertion during eight bouts and the total sweat loss from the start to the end of experiment were significantly greater for the 38°C condition than for the 32°C and 34°C conditions. These results suggest that thigh temperature of approximately 36°C may be optimal to maintain repeated maximal cycling exercise performance with the attenuation of heat stress.
Keywords :
biomechanics; humidity; muscle; occupational stress; cycling exercise; human heat stress attenuation; load intensity; optimum muscle temperature determination; perceived exertion; relative humidity; temperature 17 degC; temperature 30 degC to 38 degC; temperature 44 degC; temperature 6 degC; total sweat loss; tube perfused water; tympanic temperature; work performance; Attenuation; Heart rate; Heating; Muscles; Stress; Temperature measurement; Thigh; heat stress; optimum tissue temperature; repeated maximal cycling;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Advanced Applied Informatics (IIAIAAI), 2014 IIAI 3rd International Conference on
Conference_Location :
Kitakyushu
Print_ISBN :
978-1-4799-4174-2
Type :
conf
DOI :
10.1109/IIAI-AAI.2014.160
Filename :
6913404
Link To Document :
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