title: Sleep bruxism is associated with a rise in arterial blood pressure.
abstract: OBJECTIVE
  Sleep bruxism (SB) is a movement disorder identified by grinding of teeth and rhythmic masticatory muscle activity (RMMA). RMMA is associated with body movements and cortical arousals. Increases in autonomic sympathetic activities that characterize sleep cortical arousal precede RMMA/SB. Based on these findings, this study examined whether RMMA/SB episodes are also associated with significant changes in arterial blood pressure (BP).
  
  
  METHODS
  Participants underwent 3 nights of full polysomnography that included noninvasive beat-to-beat BP recording. Single RMMA/SB episodes and arousal episodes were analyzed in stage 2 sleep and categorized as: (i) RMMA/SB + arousal; (ii) RMMA/SB + body movement; (iii) RMMA/SB + arousal + body movement; or (iv) arousal alone. Sleep and RMMA/SB data were compared to a Non SB group. RMMA/SB clusters (RMMA/SB episodes ≤ 30 sec apart) were also analyzed.
  
  
  METHODS
  Sleep Laboratory at l'Hôpital du Sacré-Coeur de Montréal.
  
  
  METHODS
  Ten young, healthy participants with SB (mean age = 26 ± 1.8 years) and 9 without SB (mean age = 29 ± 1.2 years).
  
  
  METHODS
  N/A MEASUREMENTS AND RESULTS: BP increased with all RMMA/SB and arousal episodes (P ≤ 0.05). The average maximum BP surges (systolic/diastolic ± SE mm Hg) were: 25.6 ± 3.3/12.6 ± 2.0 for RMMA/SB + arousal; 30.1 ± 1.7/19.1 ± 1.9 for RMMA/SB + body movement; 26.0 ± 2.8/15.1 ± 2.0 for RMMA/SB + arousal + body movement; 19.4 ± 2.3/8.9 ± 1.2 for arousal alone; and for RMMA/SB clusters: Episode: 1: 26.2 ± 8.7/16.4 ± 5.7; Episode 2: 21.1 ± 7.9/12.6 ± 6.4.
  
  
  CONCLUSIONS
  Rhythmic masticatory muscle activity/sleep bruxism (RMMA/SB) is associated with blood pressure fluctuations during sleep. Arousals and body movements often occur with RMMA/SB and can impact the magnitude of this BP surge.
authors.affiliation: Faculté de Médecine Dentaire, Université de Montréal, Québec, Canada.
authors.forename: Angela
authors.initials: A
authors.lastname: Nashed
authors.forename: Paola
authors.initials: P
authors.lastname: Lanfranchi
authors.forename: Pierre
authors.initials: P
authors.lastname: Rompré
authors.forename: Maria Clotilde
authors.initials: MC
authors.lastname: Carra
authors.forename: Pierre
authors.initials: P
authors.lastname: Mayer
authors.forename: Roberto
authors.initials: R
authors.lastname: Colombo
authors.forename: Nelly
authors.initials: N
authors.lastname: Huynh
authors.forename: Gilles
authors.initials: G
authors.lastname: Lavigne
mesh_terms: D000328:Adult; D001143:Arousal / Q000502:physiology; D001794:Blood Pressure / Q000502:physiology*; D015992:Body Mass Index; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D008297:Male; D009068:Movement / Q000502:physiology; D017286:Polysomnography; D020186:Sleep Bruxism / Q000150:complications / Q000503:physiopathology*; D012894:Sleep Stages / Q000502:physiology