[Concentration and rate of depletion of glycogen in fast and slow rat muscles].

Glycogen content of the fast m. tibialis anterior at rest is higher than in the slow m. soleus: 0.

[The influence of learning on the "setting" of the spinal apparatus of reciprocal inhibition prior to voluntary motion].

The subjects performed daily for nine days from 200 to 250 single movements, namely a rapid dorsal flexion of the foot. Recording of the EMG of antagonist muscles and testing by the single and paired H-reflexes method has revealed three phenomena of learning: greater ratio of electrical activity (EA) of antagonist muscles owing to the enhanced agonist's EA; stronger reciprocal inhibition of the antagonist motoneurone nucleus at the beginning of the movement; enhanced supraspinal "tuning" of the spinal apparatus of the antagonist reciprocal inhibition before the beginning of the movement. It is suggested that the third phenomenon of learning underlies two phenomena.