Britton T C, Meyer B U, Herdmann J, Benecke R
Department of Neurology, University of Düesseldorf, Federal Republic of Germany.
Muscle Nerve. 1990 May;13(5):396-406. doi: 10.1002/mus.880130506.
The application of rapidly changing magnetic fields (magnetic stimulation) over the neck or lower back elicits EMG responses in the muscles of the arm or leg respectively. Such responses have stable onset latencies but their amplitudes vary depending on the position of the coil over the neck or lower back. Supramaximal responses could not be obtained. Comparison of onset latencies with estimates of peripheral conduction time using a conventional F-wave technique suggest that the site of excitation of the motor axons is about 1.3 msec conduction time distal to the cervical motoneurons and 3 msec distal to the lumbosacral motoneurons. Response configuration after paravertebral magnetic stimulation was similar to that of the standard electrically evoked M-wave in the small hand muscles but not in lower limb muscles. Responses in lower limb muscles after paravertebral magnetic stimulation may consist of additional F-wave and H-reflex components. The possible clinical role of paravertebral magnetic stimulation in the investigation of peripheral and central motor pathways is discussed in the light of these findings.
在颈部或下背部施加快速变化的磁场（磁刺激）分别会在手臂或腿部肌肉中引发肌电图反应。此类反应具有稳定的起始潜伏期，但其幅度会因线圈在颈部或下背部的位置而异。无法获得超强反应。将起始潜伏期与使用传统F波技术估算的外周传导时间进行比较表明，运动轴突的兴奋部位在颈运动神经元远端约1.3毫秒传导时间处，在腰骶运动神经元远端3毫秒处。椎旁磁刺激后的反应形态与手部小肌肉中标准电诱发M波的反应形态相似，但在下肢肌肉中则不同。椎旁磁刺激后下肢肌肉的反应可能包括额外的F波和H反射成分。根据这些发现，讨论了椎旁磁刺激在周围和中枢运动通路研究中可能的临床作用。
