[Differences in the mechanisms of thermoregulation in rats in separate and combined adaptation to cold and heat].

Combined adaptation of rats to heat and cold increasing mechanisms of thermogenesis enhances resistance to both factors and heat dissipation. Adaptive changes in thermogenesis are mainly a result of activation of adrenergic mechanisms, while the separate cold adaptation is accompanied by hyperfunction of thyroid glands. Mechanisms of heat dissipation in rats of the "combined" group increase even more than those of "heat" group.