Buller A J, Kean C J, Ranatunga K W
Department of Physiology, Medical School, University of Bristol.
J Muscle Res Cell Motil. 1987 Dec;8(6):504-16. doi: 10.1007/BF01567909.
The characteristics of isometric contractions and the force-velocity relation were studied in flexor digitorum longus, flexor hallucis longus and soleus muscles of the cat, in situ, at 37 degrees C and with nerve stimulation. The two flexors were identified as typical fast twitch muscles and the soleus as a typical slow twitch muscle. Following self-reinnervation, both fast and slow muscles retained, to a large extent, their basic contraction characteristics. The soleus muscle, when cross-reinnervated with the nerve of either flexor hallucis longus muscle or extensor digitorum longus muscle exhibited a more complete slow-to-fast transformation than when cross-reinnervated with the nerve of flexor digitorum longus muscle. The flexor digitorum longus muscle underwent a greater degree of fast-to-slow transformation than the flexor hallucis longus muscle, when each was cross-reinnervated with the soleus nerve. The data previously reported for sarcomere shortening velocities of the cross-reinnervated muscles in the rat, the rabbit and the cat are reviewed in the light of present findings. It is found that the discrepancies obtained between species and between different muscles in the same species, with respect to the degree of muscle-speed transformation following cross-reinnervation, are correlated with the differences in the size-ratio of the muscles used in the cross-reinnervation procedure.
在37摄氏度的猫体内，通过神经刺激，对趾长屈肌、拇长屈肌和比目鱼肌的等长收缩特性和力-速度关系进行了研究。这两块屈肌被确定为典型的快肌纤维肌肉，比目鱼肌则为典型的慢肌纤维肌肉。自我神经再支配后，快肌和慢肌在很大程度上都保留了其基本收缩特性。当比目鱼肌与拇长屈肌或趾长伸肌的神经进行交叉神经再支配时，其从慢肌向快肌的转变比与趾长屈肌的神经进行交叉神经再支配时更为完全。当趾长屈肌和拇长屈肌分别与比目鱼肌神经进行交叉神经再支配时，趾长屈肌比拇长屈肌发生的从快肌向慢肌的转变程度更大。根据目前的研究结果，对先前报道的大鼠、兔子和猫的交叉神经再支配肌肉的肌节缩短速度的数据进行了综述。研究发现，在交叉神经再支配后，不同物种之间以及同一物种的不同肌肉之间在肌肉速度转变程度上的差异，与交叉神经再支配过程中所使用肌肉的大小比例差异相关。
