THE STANDARDIZATION OF TEMPERATURE REGULATORY RESPONSES OF DOGS TO COLD

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Abstract
Trained unanes-thetized dogs were slowlv cooled by resting in air of 22.0 [plus or minus] 0.5[degree]C., humidity 50 [plus or minus] 5% and air velocity of 25 to 40 ft. per min. Respiratory rate and shivering movements were measured, together with rectal temps. and skin temps. on the thorax, foreleg, ear, and beneath 2 diathermy electrodes, one above and the other below the recumbent dog. After vasoconstriction and shivering had occurred, the dogs were warmed by diathermy applied at a heating rate equal to the b.m.r. From graphs, skin and rectal temp. thresholds were obtained for vasoconstriction, vasodilatation. and shivering. These values represent responses to heat and cold in a particular environment with a controlled heating rate, for comparison with responses when the temp. regulatory mechanism is impaired by drugs or lesions. A mechanical shivering recorder is described.

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