Metabolic adaptations to chronic heat exposure in the golden hamster

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Abstract
Metabolic rates of heat-acclimated hamsters, are lower than those of controls over a wide scale of ambient temperatures. The tolerance of heat-acclimated animals increases on exposure to high environmental temperatures and decreases on exposure to lower temperatures. In correlation with the reduced metabolic rates a decreased respiratory activity of isolated liver mitochondria is observed. This reduction starts after 1 day and reaches its maximum after between 2-5 days of heat exposure. After heat acclimation there is increased sensitivity of isolated mitochondria and of intact animals to the effect of uncouplers on the respiratory rate. During the acclimation period certain modifications of the respiratory chain may take place which reduce the heat production of heat-acclimated animals.

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