Endocrine and metabolic responses to cold in baboons
When mammals are stressed by cold, the endocrine system is stimulated leading to increased “chemical” thermogenesis and a rise in resting metabolic rate. Probably most fundamental to this response is increased activity of the sympathicoadreno-medullary system, and/or augmented sensitivity to the calorigenic action of catecholamines, especially norepinephrine. Thus, when cold stimuli are applied peripherally (e.g., exposure to a cold environment), or internally (e.g., cooling the hypothalamus, spinal cord, or abdomen), the sympathicoadrenomedullary system is activated in all mammalian species studied, including rat, pig, goat, sheep, rhesus monkey, baboon, and man (3).
KeywordsThyroid Stimulate Hormone Brown Adipose Tissue Cold Exposure Rest Metabolic Rate Cold Water Immersion
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