已知,对皮肤的伤害性刺激可诱发同侧肢体的肌肉反应。研究发现,下肢皮肤感觉减退的区域其H-反射增强。本研究将进一步阐明由盐酸利多卡因离子导入所致的皮肤感觉减退对肌张力的调节作用。方法18例健康志愿者,年龄20～47岁。受试者接受有效药物和安慰剂做自身对照。取俯卧位,右膝屈曲60°,踝蹠屈20～30°,用一特殊装置稳定踝关节, It is known that noxious stimulation of the skin can induce muscular reactions in the ipsilateral limbs. The study found that the lower extremity area of ​​the skin feeling diminished H-reflex. This study will further elucidate the hypothesis that skin sensation caused by iontophoresis of lidocaine hydrochloride has a regulatory effect on muscle tone. Methods 18 healthy volunteers, aged 20 to 47 years. Subjects received valid medications and placebo as their own controls. Take the prone position, right knee flexion 60 °, ankle plantar flexion 20 ~ 30 °, with a special device to stabilize the ankle joint,