A thermoregulatory function test using controlled hyperthermia.

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Abstract
A thermoregulatory function test has been developed from the controlled hyperthermia technique of heat acclimatization. The method is based on a specially designed suit assembly comprising an inner vapor barrier layer to enable sweat secreted to be drawn off and measured, an intermediate air-ventilated layer to enable body temperature to be controlled, and outer insulating layers. The temperature of the air supply to the ventilated suit, and hence body temperature, can be accurately controlled. The test is designed so that the subject''s responses can be measured during exposure to a thermally neutral climate, at the onset of sweating during slow warming, and while body temperature is controlled at a known level above normal. An evaluation of the test and the equipment was satisfactory and it was possible to measure some of the physiological changes in the thermoregulatory system which characterize heat acclimatization. It is suggested that the test could be of value in physiological studies on the human thermoregulatory system, in field studies on heat acclimatization, and in clinical studies on patients with disorders of thermoregulation.

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