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Rehabilitation Practice and Science

Translated Title

年輕成人之H-Reflex反射抑制期評估

Abstract

H-Reflex is the most common method in measuring the excitability of a-motor neuron. The aim of this study is to evaluate the suppression periods on H-Reflex in young adults. In clinical application, the amplitude of H-Reflex will be decreased after repetitive stimulation by low frequency current. This inhibitory phenomenon will influence badly on the accurancy of H-Reflex measurement. Our objects to evaluate suppression periods on H-Reflex in young adults will improve the accurancy of H-Reflex measurement.H-Reflex is inhibited after repetitive stimulation. this phenomenon is influenced by multiple factors including: (a) stimulation frequency (b) stimulation intensity (c) stimulation duration. These factors had been well studied in the past. But there are rare studies about the influence of suppression periods on H-Reflex. We design this study to evaluate the influence of suppression periods on H-Reflex in young adults to lower the fault of H-Reflex measurement. This study included 30 young healthy adults (aged 20-30 Yrs). A Dantec Counterpoint EMG instrument and standard H-Reflex measurement technique were used. The intensity to induce a maxinum H-Reflex was obtained. Current of submaxinum intensity (80% of maxinum intensity) with 1Hz frequency, and 0.5 msec duration was applied to each examinee 5 times individually, and the averaged amplitudes were recorded as baseline data. Then the same current was given 10 times consecutively to each examinee to obtain inhibitory effects. After 1-min, 2-min, 3-min, 5-min resting intervals (this resting intervals sequence should be randomized) the amplitude data were rechecked and were compared to former baseline to evaluate its suppression period. Our result was that there were inhibitory effects in 80% of all examinee. The cumulative recovery rate at 1-min, 2-min, 3-min, 5-min. was about 12.5%, 42%. 58%, and 100%, respectively All of the data returned to normal within 5-minutas. In clinical application, if H-Reflex doesn't respond veil, in order to avoid over-stimulation of H-Reflex, a 5-min resting interval is recommended. In the future, our studies will focus on influence of H-Reflex latency in CVA and spinal cord injury victims. The influence of diathermy, massage and acupuncture on H-Reflex is also new goal of investigation.

Language

Traditional Chinese

First Page

21

Last Page

25

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