Abstract
AbstractNielsen B. and M. Nielsen. Influence of passive and active heating on the temperature regulation of man. Acta physiol. scand. 1965. 64. 323–331. – The effect of passive heating through diathermia on thermoregulatory responses is compared to the effect of active heating by exercise on a Krogh bicycle ergometer in 2 human subjects. The rate of heat production in the two conditions was of the same magnitude (about 5 times the basal heat production). – The rectal temperature increased with passive heating to about the same level as during active heating and appeared, within limits, to be independent of the environmental temperature. At the same mean skin temperature conductance and sweat rate with passive and active heating were much higher than during normal rest. But in the two conditions of heating the rates of skin blood flow were equal and the rates of sweating not much different, when compared at the same mean skin temperature. The results indicate, therefore, that the main stimulus for the increase of heat dissipation during the steady state of work caused by the work itself, is the increased internal temperature, and that the changes in heat dissipation during work caused by changes in the environmental temperature within wide limits are mainly due to changes in skin temperature.
Published Version
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