Effect of Thermal Acclimation on the Stress-induced Elevation of Core Temperature in Rats

概要

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Elevation of core temperature during the loose restraint by the small cage suspended in the air of the climatic chamber in cold-acclimated rats (C-rats, reared at 10℃), heat-acclimated rats (H-rats, at 30℃) and control (N-rats, at 22～24℃) were compared. In Experiment A, rats were restrained at the temperature at which they were reared. Mean Tre during the restraint in C-, H- and N-rats were in the order C-rats >N-rats > H-rats, while tail skin temperatures were nearly the air temperatures, which indicates the vasoconstriction in the tail. In the Experiment B, rats of the three groups were restrained at the standard temperature of 25℃, there were small differences between elavated rectal temperatures of the three groups. Mean differences between the tail skin temperature and the air temperature, which are indices for the tail vasodilation, were in the order C-rats > N-rats > H-rats. From these results it is suggested that not only brown adipose tissue but also peripheral vasoconstriction contributes to the elevation of the core temperature during the loose restraint in rats.
長崎大学熱帯医学研究所の論文
1989-12-27