THE EFFECTS OF THERMAL POLYPNEA ON THE ENERGY METABOLISM, RESPIRATORY QUOTIENT, AND WATER LOSS OF DOGS

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Abstract
Thermal polypnea was produced in 6 trained unanesthetized dogs by putting them in air of 35.5[degree] C. and 50% humidity. Expts. each consisted of 7 consecutive i-hr. metabolism detns. 0% consumption progressively increased to 50-100% above basal. The higher the resp. rate the greater this rise, and the more extensive the CO2 "Auspumpung." CO2 loss was maximal in the first period, the estimated minimal R.Q. averaging 1.3. Then R.Q. dropped to about 1.0 in the next \ hr., followed by a gradual decline to a final avg. value of 0.81. Water loss during panting was on the avg. 50 mg./hr./kg. body wt., which was 8 to 10 times the basal value.