Effects of Source of Dietary Proteins and Exercise on Body Composition and Bone Metabolism in Rats on High-protein Diets

Abstract

The effects of dietary proteins of different origins (casein, pure egg protein, soy protein isolate, and liquid collagen peptides plus casein) and of voluntary running exercise on a diet including liquid collagen peptides and casein) on body composition and bone metabolism of rats after ovariectomy on high-protein diets were evaluated. The mean percentage of body fat and the mean weight of adipose tissue (perisplanchnic plus perigenital)were significantly lower in the group that exercised than in the sedentary group on the same diet. The mean weight of the humerus was significantly higher in the group that exercised than in the sedentary group on the same diet. There were no differences in calcium retention for two days or in the calcium concentration in the bones between these groups. The source of the dietary protein did not affect body composition or bone metabolism. Voluntary running execise was efficacious for body composition and bone mass of humerus in growing rats.