In striking contrastto the doubly innervated SOL fibres which retained their original M-ATPase his-tochemical type unchanged,the doubly innervated EDL fibres underwent a ra-dical transformation from the fast to the slow type.

• 双神经支配的 SOL 纤维保持其原来的肌原纤维三磷酸腺苷酶(M-ATP_(ase))组织化学类型不变,而双神经支配的 EDL 纤维则与此成鲜明的对比,其组织化学类型彻底地从原来的快型变为慢型。