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Beneficial Effect of Low-Fat Diets on the Swimming Performance of Rats and Mice in Cold Water¹

From the Department of Biochemistry and Nutrition, University of Southern California, Los Angeles

The swimming performance of rats and mice at a water temperature of 20°C. was inversely proportional to the fat content of the diet. Animals fed purified fat-free diets or similar diets supplemented with 1% cottonseed oil or 1% hydrogenated coconut oil swam significantly longer than animals fed similar rations supplemented with 10% cottonseed oil or 10% hydrogenated coconut oil. Intermediate results were obtained at a 2.5% level. The protective effect of low fat rations in mice was manifest within three days of feeding. When swimming tests were conducted at a water temperature of 37°C., no significant difference in swimming performance occurred between the various dietary groups.

Manuscript received 6 January 1954.