The H reflex is the expression of a monosynaptic reflex, and then the H/M ratio contribute to the excitability of motorneuron in reflex arc. The spasticity is major problem of the rehabilitation management, but the mechanism of the spasticity is still unknown and suggest intrinsic hyperexcitability response of the a motorneuron. So, we provide the measure of motorneuron excitability under normal, spastic and rigid subjects using H/M ratio in H-reflex of EMG. 1) The H/M ratio of 14 normal persons are range 8.3-37.8% mean 20.46±8.4% 2) The H/M ratio of spastic 18 limbs of 14 persons are range 18.2-7.8%, mean 45.6 ± 17.85%. The P-value is highly significantly than Normal (P<0.05) 3) The H/M ratio of spastic affected 10 limbs are, mean 48.72±19.83%, highly significant than unaffected limbs, mean 21.28±10.59% (P<0.05). 4) The H/M ratio of rigid 4 limbs of 2 persons are range 12.5-29.1%, mean 22.68±4.4%. The P-value is not highly significant than normal (P>0.05). |