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Comparison of Air Shower and Vest Auxiliary Cooling during Simulated Tank Operations in the Heat

机译:模拟储罐运行过程中空气淋浴和背心辅助冷却的比较

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An evaluation of the effectiveness of air shower and vest auxiliary cooling was carried out on two tank crews in combat vehicle crewmen clothing and chemical protective clothing. The M1E1 Main Battle Tank was parked in a climatic chamber with environmental conditions of 91 F dry bulb, and 78 F wet bulb temperature. Crewmen performed standard tank exercises in a closed hatched tank for a duration of 2-hours and 45 minutes. Heart rate, rectal and skin temperatures were monitored continuously on each crewmen. Final rectal, mean body and skin temperatures were statistically higher (p less than 0.05) during air shower (99.7, 98.6 and 96.3 F, respectively) compared to vest auxiliary cooling (99.0, 95.2 and 87.6 F, respectively). Final heart rate responses were higher (p less than 0.05) during air shower compared to vest cooling (112 and 91 beats per minute, respectively) for the crews. Total sweat losses were also greater (p less than 0.01) during air shower (1.29 liters) compared to vest test (0.64 liters). One crew attempted the exposure with usage of the M13A1 particulate filter in operation. This exposure was discontinued following the incapacitation of two crewmen within 84 minutes, though thermal strain was only moderate. It is clear that vest auxiliary cooling is more effective for crewmen cooling than an air shower. It must also be emphasized that in these ambient conditions, an air shower provides adequate cooling power.

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