The Effects of Scalp-cortex Distance on Motor Evoked Potential Elicited by Transcranial Magnetic Stimulation of the Lower Limb Motor Cortex

• TATEMOTO Tsuyoshi

  Tokyo Bay Rehabilitation Hospital

• YAMAGUCHI Tomofumi

  Tokyo Bay Rehabilitation Hospital Department of Rehabilitation Medicine, Keio University School of Medicine

• TANABE Shigeo

  Faculty of Rehabilitation School of Health Sciences, Fujita Health University

• OTAKA Yohei

  Tokyo Bay Rehabilitation Hospital Department of Rehabilitation Medicine, Keio University School of Medicine

• KONDO Kunitsugu

  Tokyo Bay Rehabilitation Hospital

• TANAKA Satoshi

  Laboratory of Psychology, Hamamatsu University School of Medicine

Bibliographic Information

Other Title

• 頭皮- 皮質間距離が経頭蓋磁気刺激法による下肢一次運動野の運動誘発電位に及ぼす影響

Abstract

Purpose: The purpose of the study was to examine the effects of scalp-cortex distance on motor evoked potentials (MEPs) elicited by transcranial magnetic stimulation (TMS) in the lower limb motor cortex. Methods: Ten healthy adults participated in the study. The MEPs evoked by TMS of the left primary motor cortex of the lower limb were assessed. The stimulation intensity was set at 100%, 110%, 120%, 130%, and 140% of the resting motor threshold (rMT). MEPs were recorded from the right tibialis anterior muscle. The distance between the scalp and the left precentral gyrus was calculated from T1-weighted magnetic resonance images of the brain. We examined the correlations between the scalp-cortex distance and the values of rMT, MEP amplitude, and the root mean square value (RMS) of electromyogram signal in a 100 ms window between 20 ms and 120 ms after TMS using Spearman’s rank correlation coefficients. Results: There were significant correlations between the scalp-cortex distance and the MEP amplitude at 140% rMT, and between the scalp-cortex distance and RMS at 140% rMT. Conclusion: Our findings suggest that the scalp-cortex distance affects the TMS evaluation of the lower limb motor cortex excitability.

Journal

• Physical Therapy Japan

  Physical Therapy Japan 43 (6), 469-476, 2016

  Japanese Physical Therapy Association

Keywords

• Transcranial magnetic stimulation (TMS)
• Magnetic resonance imaging (MRI)
• Primary motor cortex
• Lower limb
• Motor evoked potential

Details

• CRID: 1390282679739058816
• NII Article ID: 130005251434
• DOI: 10.15063/rigaku.11162
• ISSN: 2189602X
• ISSN: 02893770
• Text Lang: ja
• Data Source:
  • JaLC
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed