The Influence of Respiratory Protective Devices on Wearers at Sub- Maximum Dosed Work Stress.
NIOSH 1980 Sep:299-314
The stress of wearing a respiratory protective device was investigated. Volunteers ranging from 18 to over 51 years of age ran on a treadmill set at 2.25 kilometers per hour with an 11 percent incline. Each subject ran the treadmill wearing a compressed air breathing apparatus or filter cartridge equipment, with or without a facepiece, with or without the compressed air or cartridge. The influence of the weight of the equipment, breathing resistance, and facepiece deadspace on stress on the lungs and cardiovascular system was measured. The heartbeat frequency rose an average of three and 11 beats per minute, respectively, with the addition of a facepiece and facepiece plus cartridge, due mostly to dynamic deadspace of the facepiece. The compressed air breathing apparatus increased the rate a total of 24 beats per minute due to the weight of the apparatus. The 16 kilogram weight also increased the wearer's breathing minute volume by up to 7 liters per minute. Although no effect on breathing minute volume was observed in wearers of the cartridges, they did express discomfort due to breathing resistance. The authors propose that this type of information be considered when performance standards are set.
Physiological-stress; Physical-exercise; Ergonomics; Respiratory-protective-equipment; Personal-protective-equipment;
Control Technology and Personal Protective Equipment; Research Tools and Approaches;
Papers from the NIOSH International Respirator Research Workshop, September 9-11, 1980, Division of Safety Research, NIOSH, Morgantown, WV