System identification of mechanomyogram in voluntary contraction of abductor digiti minimi muscle

Takahiro Kato, Takanori Uchiyama

Research output: Contribution to journalArticle

Abstract

The purpose of this study is to establish a method for identifying the transfer function between the electromyogram (EMG) and mechanomyogram (MMG) in voluntary contraction of the abductor digiti minimi muscle using a system identification method. An MMG and EMG in twitch-like contraction were measured. The measurements were repeated ten times. The EMG was full-wave rectified and then smoothed with a low-pass filter (fc=100 Hz). The smoothed EMG and the MMG were regarded as an input and an output of the system, respectively. The transfer function was identified with the subspace state space system identification method. The transfer function could be approximated with a third-order model for all subjects in five measurements or more. It was suggested that the MMG system was identified in voluntary contraction.

Original languageEnglish
Pages (from-to)1-2
Number of pages2
JournalTransactions of Japanese Society for Medical and Biological Engineering
Volume54
Issue numberPROC
Publication statusPublished - 2016

Fingerprint

Transfer functions
Muscle
Identification (control systems)
Low pass filters

Keywords

  • Electromyogram
  • Mechanomyogram
  • System identification
  • Voluntary contraction

ASJC Scopus subject areas

  • Biomedical Engineering

Cite this

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AB - The purpose of this study is to establish a method for identifying the transfer function between the electromyogram (EMG) and mechanomyogram (MMG) in voluntary contraction of the abductor digiti minimi muscle using a system identification method. An MMG and EMG in twitch-like contraction were measured. The measurements were repeated ten times. The EMG was full-wave rectified and then smoothed with a low-pass filter (fc=100 Hz). The smoothed EMG and the MMG were regarded as an input and an output of the system, respectively. The transfer function was identified with the subspace state space system identification method. The transfer function could be approximated with a third-order model for all subjects in five measurements or more. It was suggested that the MMG system was identified in voluntary contraction.

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