Electromyographic evaluation of masticatory muscles in individuals with hemiparesis and temporomandibular disorder

Aims: The aims of the present study were to monitor electromyography activity in the masticatory muscles of individuals with both hemiparesis and Temporomandibular Disorders and determine possible correlations with gender and time elapsed since the stroke event. Methods: A descriptive, cross-sectional study was conducted involving 50 individuals. Group 1 comprises individuals with complete hemiparesis and Group 2 comprises individuals with incomplete hemiparesis. The Research Diagnostic Criteria for Temporomandibular Disorders was used for the diagnosis of Temporomandibular Disorders. To capture the electromyography signal of the masseter and anterior temporal muscles bilateral was used a four-channel acquisition system. Results: There was a statistically significant difference between the right and left side was found in the electromyography signal to the jaw at rest, both in the group with complete hemiparesis and the group with incomplete hemiparesis. No statistically significant differences in the EMG signal were found between the right and left sides during isometric contraction or isotonic contraction. Conclusions: The hemiparesis alters electromyographic signals in the masticatory muscles with the mandible at rest. Negative correlations were found between the electromyography signal and both the male gender and time elapsed since the stroke, demonstrating less electrical activity with a longer time since the neurological event, especially among men.