Abstract
Activity of muscle spindles of fast (extensor digitorum longus) and slow (soleus) muscles was studied in cats during hypokinesia of the limb immobilized in a plaster cast. Spontaneous activity of muscle spindles of the fast and slow muscles was unchanged during hypokinesia. Spontaneous activity of primary and secondary endings evoked by passive stretching of the muscle exceeded normal. During stretching of the muscles at different speeds and of different amplitudes, the discharge frequency of the primary and secondary endings was much greater than normally during both the dynamic and the static phase of stretching. These changes were more marked in the slow muscles.
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