Toft E, Sinkjaer T
Department of Medical Informatics and Image Analysis, Aalborg University, Denmark.
Acta Neurol Scand. 1993 Nov;88(5):327-33. doi: 10.1111/j.1600-0404.1993.tb05352.x.
Soleus H-reflexes during tonic contractions and isometric ramp contractions of the ankle extensors in spastic and healthy subjects were measured. During the tonic contractions, the H-reflex increased with the contraction level. The increase was highest in the patients (p < 0.001). The facilitation of the H-reflex during a ramp contraction is due to a static component resulting from the increased excitation level and a dynamic component resulting from the modulation of the H-reflex. The dynamic H-reflex facilitation during the ramp contraction was decreased in the patients (p < 0.05). The findings suggest that there is a decreased H-reflex control in spastic patients and this could be explained by a decreased presynaptic inhibition or by postsynaptic changes.
在痉挛患者和健康受试者中，测量了踝关节伸肌等长强直收缩和等长斜坡收缩期间的比目鱼肌Hoffmann反射（H反射）。在强直收缩期间，H反射随收缩水平增加。患者中这种增加最为显著（p < 0.001）。斜坡收缩期间H反射的易化作用是由兴奋水平增加导致的静态成分和H反射调制导致的动态成分引起的。患者在斜坡收缩期间动态H反射易化作用降低（p < 0.05）。这些发现表明，痉挛患者存在H反射控制能力下降，这可能是由于突触前抑制降低或突触后变化所致。
