The effect of temperature and humidity levels in a protective mask on user acceptability during exercise.
Nielsen-R; Gwosdow-AR; Berglund-LG; DuBois-AD
Am Ind Hyg Assoc J 1987 Jul; 48(7):639-645
The influence of air temperature and humidity within an industrial mask on the acceptability, thermal sensation, and comfort of subjects working in different ambient temperatures was investigated. Six healthy subjects with an average age of 28 years were evaluated for heart rate versus measured oxygen consumption prior to mask evaluation. Subjective and physiological responses from the subjects were monitored while they exercised for 15 minutes on a bicycle ergometer while wearing a ventilated face mask. Ambient temperatures were adjusted to 7, 16 or 25 degrees-C. Mask air temperatures were adjusted to 22, 27 or 33 degrees-C. Relative humidities were adjusted to either 61 or 86 percent. Ambient air temperature was found to be the primary determinant of acceptance of both the ambient thermal environment and of the thermal microclimate within the test mask. However, both the air temperature and the humidity within the mask also influenced acceptability. Acceptance of the thermal work conditions decreased at both 7 and 25 degrees-C. A mask air temperature of greater than or equal to 27 degrees-C was found to be completely acceptable in the warm environment. Mask humidity was observed to decrease acceptability only when high relative humidities were combined with high mask temperatures.
NIOSH-Publication; NIOSH-Grant; Equipment-design; Physiological-response; Physical-stress; Respiratory-protection; Respiratory-protective-equipment; Respirators; Thermal-effects
None John B Pierce Foundation, Inc 290 Congress Avenue New Haven, Conn 06519
Respirator Research; Respirators
American Industrial Hygiene Association Journal
John B. Pierce Foundation Lab, Inc., New Haven, Connecticut