Characteristics of Grouped Discharge Waveforms Observed in Long-term Masseter Muscle Electromyographic Recording: A Preliminary Study

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We investigated the characteristics of grouped discharge (GD) waveforms obtained from long-term masseter electromyogram (EMG) recording in 6 female temporomandibular disorder (TMD) patients with myofascial pain and 6 healthy females. The EMG measurement was performed from the morning of the experiment day until the subject woke up the next day. We observed a significantly larger number of GD waveforms in the TMD group compared to the control group (p=0.002). Our results indicate that the existence of GD waveforms in masseter EMGs might be a predictor of future TMD with myofascial pain.

Original languageEnglish
Pages (from-to)357-360
Number of pages4
JournalActa medica Okayama
Issue number4
Publication statusPublished - Aug 1 2019



  • electromyography
  • grouped discharge
  • masseter muscle
  • temporomandibular disorder

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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