Wagner S, von Waldenfels A, Meinck H M
Department of Neurology, University of Heidelberg, INF 400, 69120, Heidelberg, Germany.
Neurosci Lett. 2000 Feb 18;280(2):127-30. doi: 10.1016/s0304-3940(00)00759-x.
We investigated the influence of the innervation pattern on the transmission of reflexes to a hand muscle. Reflexes were elicited by repetitive median nerve stimulation and recorded from the abductor pollicis brevis muscle. Both H and long loop reflexes were exclusively attenuated by irregular isotonic thumb abduction. In 10 of 15 experiments the long loop reflex was blocked completely. Inhibition intercalated between the H and long loop reflexes also decreased considerably. The observed attenuation of both spinal and supraspinal reflexes is suspected to take place mainly at the spinal level. Among the possible mechanisms, reciprocal inhibition is the most likely.
我们研究了神经支配模式对反射向手部肌肉传递的影响。通过重复刺激正中神经引出反射，并从拇短展肌记录反射。H反射和长环反射均因不规则等张拇指外展而仅被减弱。在15个实验中的10个实验中，长环反射被完全阻断。介于H反射和长环反射之间的抑制也显著降低。观察到的脊髓和脊髓上反射的减弱被怀疑主要发生在脊髓水平。在可能的机制中，交互抑制是最有可能的。
