Sleep and Breathing

, Volume 16, Issue 4, pp 1069–1072 | Cite as

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 KubokiEmail author
Original Article



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.


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.


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.


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.


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



This study was also supported in part by Grant-In-Aids (#16591949, #18592122, and #20592265) for Scientific Research from the Ministry of Education, Science and Culture, Japan. The authors declare that they have no conflict of interest.


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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Hajime Minakuchi
    • 1
  • Chiyomi Sakaguchi
    • 1
  • Emilio S. Hara
    • 1
  • Kenji Maekawa
    • 1
  • Yoshizo Matsuka
    • 1
  • Glenn T. Clark
    • 2
  • Takuo Kuboki
    • 1
    Email author
  1. 1.Department of Oral Rehabilitation and Regenerative MedicineOkayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesOkayamaJapan
  2. 2.Division of Diagnostic Science, School of DentistryUniversity of Southern CaliforniaLos AngelesUSA

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