title: [Characteristic of mandibular muscle activity in patients with obstructive sleep hypopnea apnea syndrome].
abstract: OBJECTIVE
  To establish an index that can evaluate the genioglossus muscle activity and investigate the relationship between the genioglossus muscle activity and the severity of patients with obstructive sleep hypopnea apnea syndrome (OSAHS).
  
  
  METHODS
  Mandibular muscle electromyography (EMG) and polysomnography (PSG) were used in fifty patients with OSAHS. The difference of mandibular muscle activity between the twice muscle activity of fifteen patients and between in non rapid eye movement (NREM) stage and rapid eye movement (REM) stage on fifty patients were analyzed. The relationship between the index and age, body mass index (BMI), apnea hypopnea index (AHI), and the lowest oxygen saturation was evaluated.
  
  
  RESULTS
  There was no statistical difference between the twice muscle activity in fifteen patients. The average index in NREM was 1.84 +/- 0.64 (x(-) +/- s, the same below), in REM was 1.68 +/- 0.48. The difference of mandibular muscle activity between in NREM stage and REM stage was significant (t = 2.849, P < 0.05). By pearson test there was relationship between the index and age and AHI, the correlation coefficient was -0.336, -0.339, -0.338 and P < 0.05. There was no relationship between the index and BMI and the lowest oxygen saturation.
  
  
  CONCLUSIONS
  This index that is stable can evaluate the mandibular muscle activity to some degree.
authors.affiliation: Department of Otorhinolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Ministry of Education, Beijing, China.
authors.forename: Guo-hui
authors.initials: GH
authors.lastname: Xu
authors.forename: Jing-ying
authors.initials: JY
authors.lastname: Ye
mesh_terms: D000328:Adult; D000368:Aged; D004576:Electromyography; D006801:Humans; D008297:Male; D008334:Mandible / Q000503:physiopathology; D008875:Middle Aged; D009129:Muscle Tonus; D010156:Palatal Muscles / Q000503:physiopathology*; D017286:Polysomnography; D020181:Sleep Apnea, Obstructive / Q000503:physiopathology*; D055815:Young Adult