PHYSIOLOGIC RESPONSE TO TRANSIENT HEAT STRESS IN REFLECTIVE VERSUS NONREFLECTIVE CLOTHING
Final rept., May 1962-Mar 1963
AIR FORCE AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OH
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Six subjects wearing either nonreflective or reflective outer garments of equal insulative value 1 clo and unventilated were exposed in 96 experiments to heat pulses of 93 degrees, 121 degrees, 149 degrees, and 177 degrees C for 15, 12, 9, and 2 minutes, respectively ex periments were designed to simulate a range of re-entry heat exposures produced by malfunction or failure of the air-conditioning system of the vehicle. Total experimental time included the heat pulse and subsequent recovery period and was constant 40 minutes for all conditions. Mean weighted skin and rectal temperatures, heart rate, total sweat produced and evaporated, and cardiac output, indirectly derived from blood pressure measurements, were the observed physiologic parameters. Evaluation of each parameter, individually, indicates that for some there is no relation between the physiologic response, the type of garment protection, and the level of thermal stress, while for others there is marginal bene fit derived from wearing aluminized outer clothing. At only one time-intensity profile did the physiologic penalty of wearing nonreflective outer clothing appear more than marginal. However, even under the most severe conditions of thermal stress and absence of reflective protection, none of the physiologic responses approached tolerance limits in our terms of reference.
- Stress Physiology