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KMID : 0378019890320110043
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New Medical Journal
1989 Volume.32 No. 11 p.43 ~ p.48
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The Ratio of Maximum H Reflex to Maximum M Response and H-reflex Recovery Curve in Normal Subjects, Patients with Spastisity and Rigidity
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Abstract
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The excitability of spinal motor neurons was determined by the ratio between the maximum H reflex and the maximum M responses (Hmax / Mmax) and the H reflex recovery curve to preceding electrical stimuli of identical intensity in normal, spastic and rigid limbs. The H reflex recovery curve is a graph of the ratio of the second H response amplitude to the first as a function of the time interval between stimuli.
In Hmax / Mmax study, the normal range of variation is so great (0.12- 0.62) and the overlap between spasticity or rigidity is too wide to permit the establishment of "normal" values. Moreover the mean values in spasticity (0.28) or rigidity (0.20) is not increased than normals(O.33).
In H-reflex recovery curve, the excitability was much greater than normals in patients with spasticity and rigidity during the recovery. The return of the reflex began at 30-40msec and was maximal at about 200-275msec in all three groups, though of different degrees. In normals the recovery lasted more than 4 seconds. In spasticity the recovery was more speeder whereas in rigidity, not different from normals.
From these results, it might be concluded that H reflex recovery curve is helpful in the assessment of the excitability of spinal motor neuron whereas Hmax / Mmax is not.
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