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目的：研究磁刺激肌肉脑诱发电位（ＭＭＳＥＰ）的传入机制。方法：对肌松弛下腓肠肌ＭＭ－ＳＥＰ及电刺激踝部胫后神经体感诱发电位（ＳＥＰ）进行配对对比研究。结果：（１）肌松弛无肌收缩时仍可记录到ＭＭＳＥＰ；（２）配对腓肠肌ＭＭＳＥＰ与胫后神经ＳＥＰＰ４０潜伏期差值伴与不伴肌收缩相差显著；（３）伴肌收缩时，ＭＭＳＥＰ较配对ＳＥＰＰ４０潜伏期显著延长，不伴肌收时则相差不显著。结论：正常伴肌收缩时，磁刺激很可能先兴奋肌肉运动神经末梢致肌肉运动，间接兴奋肌肉Ｉａ纤维或（和）肌肉深部感受器；由此可解释ＭＭＳＥＰ较电刺激同等水平ＳＥＰＰ４０潜伏期长。
Objective: To study the afferent mechanism of magnetic stimulation of muscle evoked potential (MMSEP) in rats. Methods: Paired contrast studies were performed on MM-SEP with gastrocnemius muscle relaxation and electro-stimulation of ankle tibial nerve somatosensory evoked potential (SEP). Results: (1) MMSEP could still be recorded when there was no muscular contraction in muscle relaxation; (2) The difference between the latency of MMSEP and the posterior tibial nerve SEPP40 in paired gastrocnemius muscle was significant; (3) Paired SEPP40 latency was significantly prolonged, without muscle contraction was not significantly different. CONCLUSIONS: During normal contractions, it is likely that magnetic stimulation stimulates the muscle movement of the muscle motor nerve endings and indirectly excites the muscle Ia fibers and / or the deep muscle receptors of the muscles. Thus, it can be interpreted that MMSEP has a longer incubation period than the same level of electrical stimulation.