EFFECTS OF 10-DAY AEROBIC TRAINING ON THE ENERGY POTENTIAL AND BLOOD-SUPPLY OF SKELETAL-MUSCLE IN RATS

The activity of mitochondrial creatine kinase is found to increase in skeletal muscles of rats after ten days of running a treadmill. Over t hat short period, however, no significant increases occur either in th e maximal rate of mitochondrial respiration or in the number of capill aries per skeletal muscle fiber and their density, nor are the early a daptive changes in muscle tissue accompanied by modifications in the r esistive or metabolic compartments of the vascular bed, i.e. by improv ements in the blood supply to muscle tissue.