| Summary: | 碩士 === 國立交通大學 === 機械工程學系 === 99 === Previous studies have shown that muscle vibration (MV), below the threshold of inducing illusory movement or tonic vibration reflex, could modulate motor-evoked potentials (MEPs) of pathways controlling hand muscles in intact individuals. It is evident that this type of sub-threshold muscle vibration provides corticomotor modulations on the pathways controlling the vibrated and adjacent non-vibrated muscles. However, spinal-level contribution to the muscle vibration-induced changes in MEPs is not clear. We proposed a systematic approach for inducing and quantifying stretch reflex in strokes, and examined the effects of muscle vibration on the excitability of the spinal neural pathway. There muscles were examined: first dorsal interossei (FDI), abductor pollicis brevis (APB) and abductor digiti minimi (ADM). We tested four stroke subjects in our study. The results indicated that the amplitudes of short-latency stretch reflex (M1 Peak) of the three finger muscles were depressed during muscle vibration as compared to those with no vibration (MV: 71.53%MVC vs. No MV: 79.46%MVC). Muscle vibration did not affect the latency of either M1 or M2. These findings suggest that muscle vibration-induced MEPs facilitation may not occur in the spinal-level pathway. In addition, we also proposed a systematic approach for selecting stretch reflex with high correlation between trials.
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