[The action of methandrostenolone and ecdysterone on the physical endurance of animals and on protein metabolism in the skeletal muscles].

The results of the comparative study on the myotropic activity of methandrostenolone and ecdysterone and their effects on physical endurance of animals suggested that ecdysterone possessing a wider spectrum of the anabolic action on the contractile proteins of the skeletal muscles exerts a more pronounced influence on physical endurance of animals without their preliminary training.