Multiple sleep bruxism data collected using a self-contained EMG detector/analyzer system in asymptomatic healthy subjects

Hajime Minakuchi, Chiyomi Sakaguchi, Emilio S. Hara, Kenji Maekawa, Yoshizo Matsuka, Glenn T. Clark, Takuo Kuboki

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Purpose: Small, self-contained electromyographic (EMG) detector/analyzer (D/A) devices have become available for the detection of jaw muscle activity events above threshold. These devices claim to be less intrusive to the subjects sleep so it is less prone to induce disturbed sleep. The objective of this study was to evaluate for night-to-night variability and examine for a systematic alteration on the first night in EMG levels. Methods: Ten asymptomatic healthy volunteers (mean age, 26.8 ± 3.78) were recorded for six sequential nights in their home environment using EMG D/A system. The device yields a nightly EMG level above threshold score on a 0-4 level. Because the data are categorical and nonparametric, the data of the ten subjects across six nights were submitted to a Friedman repeated measures ANOVA. The significant level was set as alpha equal to 0.05. Results: The median and mode values of the subjects were tabulated and analyzed and we did not find a significant difference in EMG D/A level across the six nights (p = 0.287, Kendall's coefficient of concordance = 0.124, Friedman two-way repeated measures ANOVA). The data did show clear and substantial night-to-night variability. Conclusion: Substantial night-to-night variability in masseter EMG activity levels was clearly observed in our subjects. There was no evidence of a suppressed or elevated first-night effect-like variability on masseter muscle EMG level seen in these subjects using a small portable self-contained EMG detector/analyzer. These data suggest that recordings should be at least 5-6-nights duration to establish a reasonable measure of an individual's average nightly masseter EMG level.

Original languageEnglish
Pages (from-to)1069-1072
Number of pages4
JournalSleep and Breathing
Volume16
Issue number4
DOIs
Publication statusPublished - Dec 2012

Keywords

  • Clinical assessment
  • Electromyography
  • First-night effect-like variability
  • Portable device
  • Sleep bruxism
  • Validation study

ASJC Scopus subject areas

  • Otorhinolaryngology
  • Clinical Neurology

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