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Neurones and Temperature Regulation

Report Number: AMRL TR 65-232
Author: Hammel, H. T.
Corporate Author: John B. Pierce Foundation Laboratory
Laboratory: Aerospace Medical Research Laboratories
Date of Publication: 1965-12
Pages: 38
Contract: AF 33(657)-11103
Project: 7164
Task: 716409
AD Number: AD0630462

An attempt was made to ascribe the regulation of body temperature in homeotherms to the hypothalamus and the preoptic region. Results of measurements of hypothalamic temperature and regulatory responses in the normal dog in hot, neutral and cold environments and, at various times, in the resting, waking, sleeping, exercising and fevered state, are interpreted on the assumption that the hypothalamus responds to changes in its own temperature like a proportional controller with an adjustable set point. For each thermal regulatory response, the response was as if its magnitude were proportional to the deviation of the actual hypothalamic temperature from a set point temperature, and as if the set point temperature were to increase in the cold environment, decrease in the hot environment, decrease at the onset of sleep, decrease at the onset of exercise and increase in fever. A model based on known characteristics of neurones is proposed which appears to function like a proportional controller with an adjustable set point.

RAF Centre of Aviation Medicine
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