title: Enzymic properties of myosin in fast and slow twitch muscles of the cat following cross-innervation.
abstract: 1. Following cross-innervation of the cat flexor digitorum longus muscle (F.D.L., fast-twitch) and soleus muscle (slow-twitch) the isometric twitch speed of the F.D.L. muscle decreases while the contraction time of soleus increases. The tetanus-twitch ratio of soleus is also increased.2. Myosin or myofibrils from normal or self-reinnervated fast-twitch muscles of the cat split adenosine triphosphate (ATP) more rapidly than myosin or myofibrils from slow twitch muscles.3. Following cross-innervation the myosin and myofibrillar ATPase activity of flexor digitorum longus muscle falls, to become nearly equal to that of normal or self-reinnervated soleus muscle. The ATPase activity of cross-innervated soleus muscle increases only slightly.
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism*; D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D002415:Cats; D009119:Muscle Contraction; D009121:Muscle Denervation; D009124:Muscle Proteins / Q000378:metabolism; D009132:Muscles / Q000294:innervation*; D009210:Myofibrils / Q000201:enzymology*; D009416:Nerve Regeneration; D013997:Time Factors
chemical_list: D009124:Muscle Proteins; D000255:Adenosine Triphosphate; D000251:Adenosine Triphosphatases