Morphological Changes in Red and Pale Muscles following Tenotomy

Abstract

IN recent experiments one of us¹ has shown that in rabbits the cutting of hind limb tendons produces changes in the pattern of electromyograph activity in a red muscle—soleus—at a time when no change in electromyograph activity can be observed in pale muscles. In conscious rabbits continuous electromyograph activity was recorded from the normal soleus, no matter whether the animal was standing, sitting, or jumping. After tenotomy no electromyograph activity could be recorded when the animal was sitting or standing. Only when the position of the animal was suddenly changed were short bursts of action potentials observed.