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KMID : 0352519820190010279
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Korea Univercity Medical Journal
1982 Volume.19 No. 1 p.279 ~ p.286
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H-Reflex Studies in Healthy Koreans
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Abstract
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The examination of H-reflex is done as an aid in EMG study. The neurophysiology of the H-reflex is considered to be a monosynaptic reflex. Although the reflex uses a portion of the neural pathway of the muscle stretch reflex, the two reflexes are not synonymous. In the H-reflex the afferent fibersare stimulated` directly and are free from any direct influence of the -fusimotor system, whereas in the stretch reflex the stimulus arises from the muscle spindle receptors. Tendon jerks can be elicited from many muscles, but the H reflex.´can only be evoked in the calf muscles.
The H-reflex is best elicited by submaximal stimuli.
Perhaps one of the most useful clinical applications of the H-reflex is in unilateral SI radiculopathy. It can be used with a central nervous system lesion at or below midbrain stem, and it is helpful in conditions which are believed to begin as proximal nerve dysfunctions such as the Guillain-Barrio syndrome.
130 normal persons were examined. H waves were recorded from the calf muscles with surface electrodes after stimulation of the tibial nerve in the popliteal fossa.
The results were summarized as follows:
1. The mean latency of H-reflex was 27.242.70msec(Rt: 27.362.64 msec, Lt: 27.13 2.70msec).
2. The mean value of leg length was 36.292.55cm(Rt: 36.272.64cm, Lt: 36.312.51cm).
3. There was some correlation between H-latency and leg length.
4. There was no correlation between H-latency and age.
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