Adaptation and persistence of adaptation to a cold stressor in weanling and adult rats.

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Abstract
Weanling and adult rats were immersed in cold (55[degree]F) water for fixed periods of time on 7 successive days during which adaptation was measured by a reduction in colonic temperature drop and increase in rate of colonic temperature recovery. Following this adaptation procedure, Ss were subdivided into groups and tested for persistence of adaptation 1, 4, 10, 22, and 46 days later by immersing them for the same period of time and again measuring colonic temperature drop and recovery time. No major differences in rate of adaptation or persistence of adaptation were obtained between the 2 age groups when severity of the stressor was equated on the basis of previously reported behavioral and physiological measures.

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