THE EFFECTS OF HEXOSES ON THE RESPIRATORY EXCHANGE OF RHESUS MONKEYS

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Abstract
With an open-circuit respiration chamber and accurate gas analysis, the respiratory exchange of 7 adult [female] rhesus monkeys was studied before and after adm. by stomach tube of 105 ml. of water or of 14 gs. of glucose, fructose, or galactose in the same amt. of water. The monkeys had been 24 hrs. without food, were kept at least 24 hrs. beforehand at 22[degree] to 29[degree] C, and were measured for 8 consecutive 30-min. periods at 28[degree] C. Expts. with no dose were also made. The greatest rise in R. Q. was caused by glucose, the next greatest by fructose, and the smallest by galactose. The % of the total heat production supplied by carbohydrates was greatest after ingestion of glucose, was somewhat smaller after fructose or galactose. With man the order of the sugars with respect to their effects on the R. Q. and the heat production supplied by carbohydrates is fructose, galactose, and glucose. With 5 of the 7 monkeys these 3 sugars increased heat production by 12-13% more than noted in expts. with no dose or water. The specific dynamic action of the sugars was approx. 9-11%, or somewhat greater than that found with man.

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