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Journal of Nutrition Vol. 52 No. 2 February 1954, pp. 155-163
Copyright © 1954 by American Society for Nutrition
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Effect of High Environmental Temperatures on Metabolism

I. Growth and Blood Constituents of Rats Exposed to 94°F. for 72 Hours1

Robert L. Squibb2, Miguel A. Guzman2 and Nevin S. Scrimshaw3

Instituto Agropecuario Nacional and Instituto de Nutrición de Centro América y Panamá, Guatemala City, Gutemala

Rats were subjected to a temperature of 94°F. for 72 hours and were then compared with control rats, which had been kept at a temperature of 72°F. In one set of trials they were fed ad libitum; in another they were restricted to 5 gm of feed.

With ad libitum feeding, heat-treated rats consumed less feed than control rats. They lost weight, and the levels of riboflavin, vitamin A, ascorbic acid and alkaline phosphatase in their blood sera were significantly depressed, whereas the levels of total protein were significantly elevated.

With restricted feeding, both control and heat-treated rats lost weight, and in the heat-treated rats only the vitamin A and ascorbic acid levels were significantly depressed. The exposure to high temperature had no effect on total carotenoid levels in either the ad libitum or feed-restricted groups.

1 The financial assistance of the Instituto de Fomento de la Produción of Guatemala is gratefully acknowledged.

2 Foreign Agricultural Service, U. S. Department of Agriculture, assigned to the Instituto Agropecuario Nacional, Guatemala, a technical agricultural service organization operated jointly by the Governments of Guatemala and the United States; the cooperation of the latter is under the Point IV program, administered by the Technical Cooperation Administration, U. S. Department of State, through the Institute of Inter-American Affairs.

3 Instituto de Nutrición de Centro América y Panamá, a human nutrition institute in Guatemala supported by the Governments of Central America and Panama and administered by the Pan-American Sanitary Bureau, Regional Office of the World Health Organization.

Manuscript received 13 July 1953.




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