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Multiple sleep bruxism data collected using a self-contained EMG detector/analyzer system in asymptomatic healthy
Hajime Minakuchi1, Chiyomi Sakaguchi, Emilio S Hara
1Department of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ward, Okayama, 700-8525, Japan.
Sleep & Breathing = Schlaf & Atmung
|January 27, 2012
Summary
Jaw muscle activity shows significant night-to-night variability. Portable electromyographic (EMG) detector/analyzer devices are reliable for assessing masseter EMG levels over 5-6 nights, with no first-night effect observed.
Area of Science:
- Biomedical Engineering
- Sleep Science
- Neuromuscular Physiology
Background:
- Small, self-contained electromyographic (EMG) detector/analyzer (D/A) devices offer a less intrusive method for monitoring jaw muscle activity during sleep.
- These devices aim to minimize sleep disturbance compared to traditional polysomnography.
Purpose of the Study:
- To evaluate the night-to-night variability of jaw muscle EMG levels using a portable EMG D/A system.
- To examine for a systematic first-night effect in EMG recordings.
Main Methods:
- Ten healthy volunteers underwent six consecutive nights of home-based EMG recording using a portable EMG D/A system.
- Data, yielding a nightly EMG level score (0-4), were analyzed using Friedman's repeated measures ANOVA.
Main Results:
- No significant difference in EMG D/A levels was found across the six recording nights (p=0.287).
- However, substantial night-to-night variability in masseter EMG activity was clearly observed.
- No evidence of a first-night effect was detected.
Conclusions:
- Significant night-to-night variability in masseter EMG activity is present.
- Portable EMG D/A devices do not appear to induce a first-night effect.
- A minimum recording duration of 5-6 nights is recommended for accurately assessing an individual's average nightly masseter EMG level.
