Abstract
1. 1. To determine whether long-term cold exposure induces insulative adaptation in the rat, two groups of eight adult animals each were exposed to 4 and 25°C, respectively, for 18 months. 2. 2. At any ambient temperature between —5 and 30°C, the cold adapted animals had a higher rate of oxygen uptake, and higher unfurred skin temperatures than the controls. 3. 3. At ambient temperatures below thermoneutrality, whole body thermal resistance increased continuously in both groups of animals. 4. 4. It is concluded that long-term exposure does not induce insulative adaptation, and that thermal resistance is not maximal at the lower critical temperature.
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