Physiological and subjective responses to cooling devices on firefighting protective clothing
Physiological and subjective responses to cooling devices on firefighting protective clothing
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DOI：
10.1007/s00421-007-0665-7
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发表时间：
2008-09-01
影响因子：
3
通讯作者：
Kim, Taegyou
中科院分区：
文献类型：
--
作者：
Chou, Chinmei;Tochihara, Yutaka;Kim, Taegyou
本研究的目的是检查冰袋（ICE）和相变材料（PCM）冷却装置在减少生理负荷的基础上的受试者的生理和主观反应，而受试者在自行车测力计上行使，同时穿着消防防护服在相对高温环境（30 ℃，50%RH）。受试者为8名研究生，年龄25.9岁（SD 3.2）。每个受试者参与四个50分钟的暴露：对照（CON），ICE，5 ℃ [PCM（5）]和20 ℃ [PCM（20）]的PCM。每名受试者在进入测试室之前在测试前的房间休息10分钟，然后再休息10分钟，然后进行30分钟的运动和10分钟的恢复期。运动强度设定为55%VO2max。通过测量直肠温度（Tre）、平均皮肤温度（Tsk）、体重减轻和主观反应来评价冷却效果。PCM（5）和PCM（20）的Tre增加小于CON和ICE。使用冷却装置可以抑制Tsk的增加，但PCM的冷却效果大于ICE。CON组的受试者比其他条件下的受试者感觉更热，更潮湿。PCM（5）和PCM（20）的Tre和Tsk的下降幅度大于CON和ICE，这是由于PCM（5）和PCM（20）较大的表面冷却面积、较高的熔化温度和较软的材料降低了吸收能力。此外，PCM（20）不需要制冷。这些结果表明，PCM（20）在减少穿着消防防护服时的生理负荷方面比其他冷却装置更有效。
The aim of the present study was to examine the effectiveness of ice-packs (ICE) and phase change material (PCM) cooling devices in reducing physiological load based on subjects' physiological and subjective responses while the subjects exercised on a bicycle ergometer while wearing firefighting protective clothing in a relatively high temperature environment (30 degrees C, 50%RH). Subjects were eight graduate students, aged 25.9 years (SD 3.2). Each subject participated in four 50-min exposures: control (CON), ICE, PCM of 5 degrees C [PCM(5)] and 20 degrees C [PCM(20)]. Each subject rested in a pre-test room for 10 min before entering the test-room where they rested for another 10 min, followed by 30 min-exercise and a 10 min-recovery period. The exercise intensity was set at 55%VO2max. Cooling effects were evaluated by measuring rectal temperature (Tre), mean skin temperature (Tsk), body weight loss and subjective responses. An increase in Tre for PCM(5) and PCM(20) which was less than that for CON and ICE was observed. The increases in Tsk were depressed using cooling devices, but the cooling effects of PCMs were greater than ICE. The subjects with CON felt hotter and wetter than those in the other conditions. The larger surface cooling area, higher melting temperature and softer material of PCMs which reduces absorption capacity caused a decrease in Tre and Tsk for PCM(5) and PCM(20) which was more than that for CON and ICE. Furthermore, PCM(20) does not require refrigeration. These results suggest that PCM(20) is more effective than other cooling devices in reducing the physiological load while wearing firefighting protective clothing.