Gwosdow A R, Nielsen R, Berglund L G, DuBois A B, Tremml P G
John B. Pierce Foundation Laboratory, Yale University School of Medicine, New Haven, CT 06519.
Am Ind Hyg Assoc J. 1989 Apr;50(4):188-95. doi: 10.1080/15298668991374499.
The physiological and subjective responses of six sedentary subjects wearing half-facepiece respirators were observed over a wide range of room and respirator air conditions. Room air and dew-point (Ta:Tdp) temperatures were 25:11 degrees, 30:13 degrees, and 35:16 degrees C in still air. Respirator air temperatures were maintained independently of room conditions at 27 degrees, 30 degrees, 33 degrees, and 36 degrees C with relative humidity levels of 47% and 73%. Physiological measurements included local skin and dew-point temperatures. Subjective judgments of acceptability, thermal sensation, degree of discomfort, sense of skin moisture, and difficulty of breathing were recorded separately for the thermal environment in the room and inside the respirator. Respirator temperatures cooler than 33 degrees C were always comfortable and 100% acceptable; respirator air temperatures above 33 degrees C or higher humidity levels decreased respirator acceptability. Acceptability of the respirator environment decreased as lip temperature increased above 34.5 degrees C or when respirator dew-point temperature increased above 20 degrees C. Increased respirator air temperature and humidity often made breathing seem "slightly hard." The respirator conditions influenced the subjects' judgment of the acceptability of the surrounding thermal environment.
在广泛的室内和呼吸器空气条件下，观察了六名久坐不动且佩戴半面罩呼吸器的受试者的生理和主观反应。在静止空气中，室内空气温度和露点温度（Ta:Tdp）分别为25:11摄氏度、30:13摄氏度和35:16摄氏度。呼吸器空气温度独立于室内条件，保持在27摄氏度、30摄氏度、33摄氏度和36摄氏度，相对湿度水平分别为47%和73%。生理测量包括局部皮肤温度和露点温度。分别记录了受试者对室内和呼吸器内热环境的可接受性、热感觉、不适程度、皮肤湿度感觉和呼吸困难程度的主观判断。温度低于33摄氏度的呼吸器总是让人感觉舒适且100%可接受；呼吸器空气温度高于33摄氏度或湿度水平更高时，呼吸器的可接受性会降低。当嘴唇温度升高到34.5摄氏度以上或呼吸器露点温度升高到20摄氏度以上时，呼吸器环境的可接受性会降低。呼吸器空气温度和湿度的增加常常会使呼吸看起来“有点困难”。呼吸器条件影响了受试者对周围热环境可接受性的判断。
