The response of skeletal muscles to anabolic steroid is individual and does not depend on the motor activity mode

Histochemical methods demonstrated that injection of the anabolic steroid phenobolin and exercise did not modify the content of fast and slow muscle fibers in the slow (m. soleus) and fast (m. plantaris andm. semimembranosus) muscles. Energy metabolism changed only in the fast muscles. After exercise the number of oxidative muscle fibers increased in both fast muscles and after injection of anabolic steroids inm. semimem-branosus. Combined exposure produced an additive effect. The content of glycolytic muscle fibers inm. plantaris increased under the effect of anabolic steroids.