Influence of peripheral magnetic stimulation of soleus muscle on H and M waves

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  • Matsuda Tadamitsu
    Department of Physical Therapy, Faculty of Social Work Studies, Josai International University: 1 Gumyo, Togane, Chiba 283-8555, Japan
  • Kurayama Taichi
    Department of Physical Education, Faculty of Health Sciences, Uekusa Gakuen University, Japan
  • Tagami Miki
    Department of Physical Therapy, Faculty of Social Work Studies, Josai International University: 1 Gumyo, Togane, Chiba 283-8555, Japan
  • Fujino Yuji
    Department of Rehabilitation, Saitama Medical University International Medical Center, Japan
  • Manji Atsushi
    Department of Rehabilitation, Saitama Misato Sogo Rehabilitation Hospital, Japan
  • Kusumoto Yasuaki
    Department of Physical Therapy, Faculty of Health Sciences, Tokyo University of Technology, Japan
  • Amimoto Kazu
    Graduate School of Human Health Science, Tokyo Metropolitan University, Japan

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Abstract

<p>[Purpose] This study evaluated the effects of repetitive peripheral magnetic stimulation of the soleus muscle on spinal cord and peripheral motor nerve excitability. [Subjects and Methods] Twelve healthy adults (mean age 22 years) who provided written informed consent were administered repetitive peripheral magnetic stimulation for 10 min. Pre-and post-stimulation latencies and amplitudes of H- and M-waves of the soleus muscle were measured using electromyography and compared using paired t-tests. [Results] Pre- and post-stimulation latencies (28.3 ± 3.3 vs. 29.1 ± 1.3 ms, respectively) and amplitudes (35.8 ± 1.3 vs. 35.8 ± 1.1 mV, respectively) of H-waves were similar. Pre-stimulation latencies of M-waves were significantly higher than post-stimulation latencies (6.1 ± 2.2 vs. 5.0 ± 0.9 ms, respectively), although pre- and post-stimulation amplitudes were similar (12.2 ± 1.4 vs. 12.2 ± 1.3 mV, respectively). Motor neuron excitability, based on the excitability of motor nerves and peripheral nerve action, was increased by M-waves following magnetic stimulation. [Conclusion] The lack of effect of magnetic stimulation on the amplitude and latency of the H-reflex suggests that magnetic stimulation did not activate sensory nerve synapses of α motor neurons in the spinal cord. However, because motor nerves were stimulated together with sensory nerves, the increased H-wave amplitude may have reflected changes in peripheral rather than in α motor nerves.</p>

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