CONTRIBUTION OF THE E33 HOOD TO HEAT STRESS ON MEN WEARING CBR PROTECTIVE CLOTHING

A physiological evaluation of the hood was made to measure the increment in heat stress produced by the hood when added to the protective assembly under conditions of moderately hard work in hothumid weather, and the contribution of sunshine to the heat stress. The conclusions are: (1) The E33 hood adds measurably to the heat stress of the CBR protective assembly. The added stress at an environmental temperature of 85 F is about two thirds that of sunshine and about one half that of an increase in the marching speed from 2 to 3 mph. (2) The hood does not interfere with the performance of muscular work of moderate intensity. In the hardest work, the voluntary tolerance time is decreased about one fourth. (3) The heat strain in men working in CBR protective clothing at a given temperature outdoors in the sun can be duplicated indoors at a room temperature 10 F higher than the outdoor temperature. (Author)