Evaluation of integral electromyographic values and median power frequency values in women with myogenous temporomandibular disorder and asymptomatic controls

摘要

BackgroundSurface electromyography (EMG) has been used as a reliable tool for the evaluation of electrical muscle activity. ObjectiveThe purpose of this study was to evaluate the EMG indices of the masticatory muscles (masseter, anterior temporalis and suprahyoid) in women with temporomandibular disorder (TMD) and asymptomatic controls in the time domain, by the integrated EMG signal (IEMG) and in the frequency domain, using the median power frequency (MPF). MethodsAn observational, cross-sectional study was conducted involving 30 asymptomatic women as the control (mean age: 25.85?±?2.57 years) and 74 women with myogenous TMD (mean age: 26.54?±?2.45 years) diagnosed using the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD). Three EMG readings were taken during maximum voluntary clenching (MVC) of the molars on parafilm for five seconds with a three-minute rest interval between readings. The mixed-model analysis of variance test followed by the Bonferroni correction or the Student-t test was used for the analyses, with the level of significance set to 5% (p?