Journal of Nutrition

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Journal of Nutrition Vol. 100 No. 7 July 1970, pp. 732-738
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Effects of Diet and Altitude on the Body Composition of Rats1

Kenneth S. K. Chinn2 and John P. Hannon

Physiology Division, U. S. Army Medical Research and Nutrition Laboratory, Fitzsimons General Hospital, Denver, Colorado 80240

The body composition of growing albino rats maintained on diets high in carbohydrate, fat or protein was studied at Denver (5,280 feet) and Climax (11,400 feet), Colorado. The higher altitude had no significant effect on growth rate. It did, however, lead to decreased body fat deposition under all three of the dietary conditions. At both elevations rats receiving a high fat diet accumulated more body fat than those receiving carbohydrate or protein diets. Altitude did not affect the fat-free body mass, but a calculated shift of protein from muscle to nonmuscle tissue was observed in the animals at Climax. The effect of diet on the relative amount of estimated muscle protein at both elevations was in the following order: protein > carbohydrate > fat. Although total body water was unaffected by altitude exposure a significant shift of water from the extra- to the intracellular space was observed.

1 In conducting the research described in this report, the investigators adhered to the "Guide for Laboratory Animal Facilities and Care," as promulgated by the Committee on the Guide for Laboratory Animal Facilities and Care of the Institute of Laboratory Animal Resources, National Academy of Sciences-National Research Council, Washington, D. C.

2 Present address: Biochemistry Department, Box 14, U.S. Naval Medical Research Unit No. 2, APO 96263, San Francisco, California.

Manuscript received 29 December 1969.




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