Jetté M, Quenneville J, Thoden J, Livingstone S
School of Human Kinetics, Faculty of Health Sciences, University of Ottawa, Ontario, Canada.
Int J Biometeorol. 1992 Aug;36(3):130-5. doi: 10.1007/BF01224814.
The effects of inspiratory resistance on prolonged work in a hot environment wearing a nuclear, bacteriological and chemical warfare (NBCW) mask and overgarment were assessed in 10 males. Subjects walked on a treadmill at 5 km/hr, 2% gradient, until their core temperature reached 39 degrees C or for a duration of 90 min. Rectal temperature, heart rate, ventilation, oxygen consumption and rate of perceived breathing were measured. There were no differences between break-point time without the canister (62.2 +/- 21 min) and with the canister (58.9 +/- 17 min). Regression analysis indicated that the mean core temperature increased by 0.02 degrees C for every minute of work performed and heart rate by 6 beats/min for every increase of 0.2 degrees C in core temperature. Reduction in heat transfer brought about by wearing the protective overgarment and mask with or without the canister will significantly increase core temperature and limit the performance of moderate work to approximately 1 h in a moderately fit individual.
对10名男性受试者评估了在炎热环境中佩戴核生化战（NBCW）面具和防护服时吸气阻力对长时间工作的影响。受试者在跑步机上以5公里/小时、2%的坡度行走，直到他们的核心体温达到39摄氏度或持续90分钟。测量直肠温度、心率、通气量、耗氧量和主观呼吸率。未安装滤毒罐时的断点时间（62.2±21分钟）和安装滤毒罐时的断点时间（58.9±17分钟）之间没有差异。回归分析表明，每工作一分钟，平均核心体温升高0.02摄氏度，核心体温每升高0.2摄氏度，心率增加6次/分钟。无论是否安装滤毒罐，穿着防护服和面具都会减少热量传递，这将显著提高核心体温，并将适度健康个体的中等强度工作能力限制在大约1小时。
