胫神经H—反射消失或潜伏期延长常用于帮助确诊S_1神经根病变,但有时潜伏期对称而患侧的振幅下降。本研究目的是确定两侧胚神经H—反射振幅变异的正常范围,作为用振幅帮助诊断的参考。 参加本研究的47名健康志愿者,21～67岁(35±10岁),无明显腰痛和神经根症状史,也无周围神经病变。测试双侧跟腱反射。测双侧H—反射,所用方法类似于Braddon和Johnson法。对象取俯卧位,标出腘窝线后,把1cm大小的阴电极放在腘窝线上 H-reflex or prolongation of the tibial nerve commonly used to help diagnose S 1 nerve root lesions, but sometimes the latency is symmetrical and the amplitude of the affected side decreased. The purpose of this study was to determine the normal range of H-reflex amplitude variations on the germinal nerves on either side as a reference for the use of amplitude to aid in the diagnosis. Forty-seven healthy volunteers, aged 21-67 years (35 ± 10 years), had no history of low back pain and nerve root symptoms and no peripheral neuropathy. Test both Achilles tendon reflexes. Bilateral H-reflex, using the method is similar to Braddon and Johnson method. Subjects prone position, marked Wo nest line, the 1cm size of the cathode electrode on the nest line