Mechanism of monosynaptic reflex reinforcement during Jendrassik manoeuvre in man.
The facilitating effect of the Jendrassik manoeuvre on monosynaptic reflexes in man has been studied by comparing H and T reflexes of the soleus and by blocking the effects of spindle activation by ischaemia of the leg. The Jendrassik manoeuvre equally enhances H and T reflexes provided that the test reflexes are small. The H reflex remains facilitated when the spindle activation cannot affect the soleus alpha-motoneurones--that is, when the Ia afferent nerve fibres from the soleus are blocked by ischaemia. It is concluded that the facilitating effect of the Jendrassik manoeuvre on the alpha-motoneurones is not predominantly routed via the gamma-loop.
D000125:Achilles Tendon / Q000294:innervation; D000328:Adult; D006181:H-Reflex; D006801:Humans; D007511:Ischemia / Q000503:physiopathology; D007866:Leg / Q000098:blood supply / Q000294:innervation; D008722:Methods; D009046:Motor Neurons / Q000502:physiology; D009407:Nerve Block; D009475:Neurons, Afferent / Q000502:physiology; D012023:Reflex, Monosynaptic; D012026:Reflex, Stretch