PHYSICAL CAPACITY OF RATS IN RELATION TO ENERGY AND FAT CONTENT OF THE DIET

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Abstract
Fitness for exhausting work in rats was measured by determining the duration of a swim to exhaustion with regularly increasing work loads. The sp. gr. of rats was measured by determining body volume by displacement. There was a small positive correlation between sp. gr. and duration of swim, and a similar small correlation between body wt. and duration of swim. When diets varying in fat content from 0 to 40% were fed ad lib., physical capacity of the animals increased with increasing fat content of the diet. When caloric intake was severely restricted, physical capacity decreased markedly regardless of the fat content of the diet. After a period of severe caloric restriction during which a considerable proportion of the animals died, return to ad lib. feeding was followed by return to normal physical capacity within 6 wks.

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