title: Frequency analysis of electromyographic signals in mandibular elevators at maximum clench level.
abstract: Power spectral analysis of electromyogram (ENG) was used to investigate the relationship between mean power frequency (MPF) and sustained contraction time. Surface EMG activity was recorded from masseter and anterior temporal muscles on both sides for seven healthy subjects while clenching at intercuspal position in maximum potential level of these muscles. A visual sense feedback of EMG potential was used to control clenching level. According to linear regression analysis, there was a negative correlation between MPF of EMG and sustained contraction time. The results indicate that the slope of MPF versus contraction time may be used for detecting muscular fatigue in the stomatognathic system.
authors.affiliation: Prosthodontic Department, Stomatological Hospital, Fourth Military Medical University, Xian Shaanxi, Peoples' Republic of China.
authors.forename: C S
authors.initials: CS
authors.lastname: Shi
authors.forename: G
authors.initials: G
authors.lastname: Ouyang
authors.forename: T W
authors.initials: TW
authors.lastname: Guo
mesh_terms: D000328:Adult; D003766:Dental Occlusion; D004576:Electromyography; D005221:Fatigue / Q000503:physiopathology; D005246:Feedback; D005260:Female; D005583:Fourier Analysis; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology; D008297:Male; D008406:Masseter Muscle / Q000502:physiology*; D009119:Muscle Contraction / Q000502:physiology*; D012044:Regression Analysis; D012815:Signal Processing, Computer-Assisted; D013703:Temporal Muscle / Q000502:physiology*; D013997:Time Factors