Basic characteristics between mechanomyogram and muscle force during twitch and tetanic contractions in rat skeletal muscles

Ikumi Sato, Shusei Yamamoto, Mai Kakimoto, Moe Fujii, Koki Honma, Shota Kumazaki, Mami Matsui, Hinako Nakayama, Sora Kirihara, Shang Ran, Satoshi Hirohata, Shogo Watanabe

Research output: Contribution to journalArticlepeer-review

Abstract

The mechanomyogram (MMG) is a signal measured by various vibration sensors for slight vibrations induced by muscle contraction, and it reflects the muscle force during electrically induced-contraction or until 60%–70% maximum voluntary contraction, so the MMG is considered an alternative and novel measurement tool for muscle strength. We simultaneously measured the MMG and muscle force in the gastrocnemius (GC), vastus intermedius (VI), and soleus (SOL) muscles of rats. The muscle force was measured by attaching a hook to the tendon using a load cell, and the MMG was measured using a charged-coupled device-type displacement sensor at the middle of the target muscle. The MMG-twitch waveform was very similar to that of the muscle force; however, the half relaxation time and relaxation time (10%), which are relaxation parameters, were prolonged compared to those of the muscle force. The MMG amplitude correlated with the muscle force. Since stimulation frequencies that are necessary to evoke tetanic progression have a significant correlation with the twitch parameter, there is a close relationship between twitch and tetanus in the MMG signal. Therefore, we suggest that the MMG, which is electrically induced and detected by a laser displacement sensor, may be an alternative tool for measuring muscle strength.

Original languageEnglish
Article number102627
JournalJournal of Electromyography and Kinesiology
Volume62
DOIs
Publication statusPublished - Feb 2022

Keywords

  • Fusion index
  • Mechanomyogram
  • Muscle force
  • Tetanus
  • Twitch

ASJC Scopus subject areas

  • Neuroscience (miscellaneous)
  • Biophysics
  • Clinical Neurology

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