Heat Strain and Work Tolerance Times with Varying Levels of Canadian Forces NBC Protective Clothing, Ambient Temperature, Physical Work Intensity and Work/Rest Schedules
Final research rept.
DEFENCE AND CIVIL INST OF ENVIRONMENTAL MEDICINE DOWNSVIEW (ONTARIO)
Pagination or Media Count:
Canadian Forces personnel must be able to sustain operations in an environment contaminated with nuclear, biological andor chemical NBC agents. Clothing has been designed that protects the individual from a hostile NBC environment. This clothing, however, impairs body heat loss. The degree of impairment is magnified if metabolic heat production is increased andor environmental temperature increases. The purpose of the present study, therefore, was to examine the effects of environmental temperature and metabolic rate on soldiers physical work tolerance times WTT while wearing various levels of NBC clothing. Twenty-three male soldiers were allocated to exercise at either a light or heavy metabolic rate in an environmental chamber that controlled ambient conditions at either a cool 18 C or hot 30 C temperature. Subjects were tested wearing three levels of protective clothing their regular combat fatigues Low fatigues and the NBC overgarment Med fatigues, NBC overgarment, rubber gloves and boots, and protective respirator High. WTT was defined as the time until body temperature increased to 39.3 C normal being 37 C, heart rate reached 95 of an individuals maximum, dizziness or nausea precluded further exercise or 5 hours had elapsed.
- Medicine and Medical Research