Young male rats of Wistar strain were divided into 4 groups; high carbohydrate diet being loaded exercise or not and high protein-high fat diet being loaded exercise or not. They were kept on their respective status for 7 weeks, the body weight, urinary 17-ketosteroid (17-KS) and creatinine excretion were measured once a week.
The results obtained were as follows: 17-KS excretion was affected by the diets, its levels in the high protein-high fat dietary groups were higher than those in the high carbohydrate dietary groups. And its excretion per body weight decreased according to the growth of rats in all groups.
Physical exercise seemed to promote the excretion of 17-KS.
The effect of diets on urinary creatinine/day/rat was observed, but the effect was hardly recognized when expressed per body weight unit. It is considered from these results that the urinary creatinine excretion may be influenced rather by the body weight of the rats than diets.