Determination of Appropriate Recording Area of Mechanomyogram in Diaphragm and its Reliability using Intraclass Correlation Coefficient

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  • TAKESADA Masataka
    Graduate School of Information Science, Nara Institute of Science and Technology
  • AKATAKI Kumi
    Department of Biomedical Engineering, Osaka Electro-Communication University
  • ITOH Yasushi
    Institute for Developmental Research, Aichi Human Service Center RIKEN-TRI Collaboration Center for Human-Interactive Robot Research, RIKEN Advance Science Institute
  • MITA Katsumi
    Graduate School of Health Care Studies, Seijoh University RIKEN-TRI Collaboration Center for Human-Interactive Robot Research, RIKEN Advance Science Institute
  • SATO Tetsuo
    Graduate School of Information Science, Nara Institute of Science and Technology
  • MINATO Kotaro
    Graduate School of Information Science, Nara Institute of Science and Technology

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Other Title
  • 級内相関係数を用いた横隔膜筋音図信号の再現性評価と最適導出位置の検討
  • キュウ ナイ ソウカン ケイスウ オ モチイタ オウカクマクキンオンズ シンゴウ ノ サイゲンセイ ヒョウカ ト サイテキ ドウシュツ イチ ノ ケントウ

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The mechanomyogram (MMG) is a recording of small vibration on the body surface due to lateral expansion of contracting muscle fibers. The present investigation aimed to determine appropriate recording area in measuring the MMG from diaphragm and to clarify its reliability using intraclass correlation coefficient (ICC) for promoting clinical application of the MMG. A single twitch contraction of diaphragm was elicited by applying electric stimulation to phrenic nerve. The MMG and electromyogram (EMG) were recorded at six different areas over the surface of thorax, i. e., each two positions on 7th to 9th intercostal space. Both MMG and EMG demonstrated excellent reliability in all the recording areas with mean ICC of 0.973. The significantly greater amplitude in both signals was observed on body surface at the intersection of the 8th or 9th intercostal space and the sagittal line on the 9th rib margin. The findings suggest that the diaphragmatic MMG and EMG are derived most appropriately from these surface areas of thorax.

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