SPONTANEOUS ACTIVITY IN RELATION TO DIET IN THE ALBINO RAT

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Abstract
With basal rations so constituted as to allow maximum growth [image] and reproduction throughout the life span, the spontaneous activity was detd. in 3 groups of 18 rats each over 3 mo. periods, 2 groups being fed diets high in fat and one high in protein, compared with their litter mates fed a well-balanced ration. Activity records for the 54 rats during about 1/12 of their life span indicated: (1) that as much as 56% of the caloric value of the food may come from fat and spontaneous activity still be maintained at a normal level; (2) that 72% of fat calories depress activity a little; and (3) that 50% animal protein induces a marked decrease in activity.

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