title: Craniofacial pain and jaw-muscle activity during sleep.
abstract: This study compared the jaw-muscle electromyographic (EMG) activity during sleep in patients with craniofacial pain (n = 63) or no painful conditions (n = 52) and between patients with tension-type headache (TTH: n = 30) and healthy control individuals (n = 30). All participants used a portable single-channel EMG device (Medotech A/S) for four nights. There was no significant difference in EMG activity between craniofacial pain (24.5 ± 17.9 events/hr) and no painful conditions (19.7 ± 14.5), or between TTH (20.8 ± 15.0) and healthy control individuals (15.2 ± 11.6, p >.050). There were positive correlations between EMG activity and number of painful muscles (r = 0.188; p = 0.044), characteristic pain intensity (r = 0.187; p = 0.046), McGill Pain Questionnaire (r = 0.251; p = 0.008), and depression scores (r = 0.291; p = 0.002). Patients with painful conditions had significantly higher night-to-night variability compared with pain-free individuals (p < 0.050). This short-term observational study suggests that there are no major differences between patients with different craniofacial pain conditions and pain-free individuals in terms of jaw-muscle EMG activity recorded with a single-channel EMG device during sleep. However, some associations may exist between the level of EMG activity and various parameters of craniofacial pain. Longitudinal studies are warranted to further explore the relationship between sleep bruxism and craniofacial pain.
authors.affiliation: Department of Oral Rehabilitation, Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan.
authors.forename: W
authors.initials: W
authors.lastname: Yachida
authors.forename: E E
authors.initials: EE
authors.lastname: Castrillon
authors.forename: L
authors.initials: L
authors.lastname: Baad-Hansen
authors.forename: R
authors.initials: R
authors.lastname: Jensen
authors.forename: T
authors.initials: T
authors.lastname: Arima
authors.forename: A
authors.initials: A
authors.lastname: Tomonaga
authors.forename: N
authors.initials: N
authors.lastname: Ohata
authors.forename: P
authors.initials: P
authors.lastname: Svensson
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D016022:Case-Control Studies; D003863:Depression / Q000150:complications; D004576:Electromyography; D005157:Facial Pain / Q000150:complications / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D008410:Masticatory Muscles / Q000503:physiopathology*; D008875:Middle Aged; D019370:Observation; D010147:Pain Measurement; D020186:Sleep Bruxism / Q000150:complications / Q000503:physiopathology*; D018709:Statistics, Nonparametric; D011795:Surveys and Questionnaires; D013705:Temporomandibular Joint Disorders / Q000150:complications / Q000503:physiopathology*; D018781:Tension-Type Headache / Q000150:complications / Q000503:physiopathology*; D055815:Young Adult