IADR Abstract Archives
Family history of Rheumatoid Arthritis related to low EMG values
Objectives: Detecting the alterations of the masticatory muscles can be challenging using conventional electromyography (EMG) therefore better algorithms need to be used for optimal analysis. Rheumatoid arthritis (RA) is a systemic, autoimmune inflammatory disorder that affects the TMJ and related structures. Genetics may play a role in RA. The aim was to compare the root medium square (RMS) and the mean frequency (MNF) of surface EMG activity of masseter muscles between subjects with and without family history of rheumatoid arthritis (FHRA) that have not been diagnosed with RA.
Methods: We conducted a cross-sectional study with a convenience sample. Sociodemographic, clinical and Helkimo dysfunction index (HDI) information was recorded. Bilateral surface electromyography of masseter muscles was performed, and isometric contraction was recorded for 30 seconds. The RMS/MNF were computed and an average value for each side was obtained. The EMG system that was used was “Electromiógrafo 1.0 UNAM-CINVESTAV-IPN” a system that we developed. We recorded and analyzed the surface EMG activity of both groups and performed a multivariate regression analysis to adjust for other confounders and considering each patient as a cluster unit.
Results: We analyzed 60 adults (mean age 27, S.D.9.29). 30% were identified with FHRA. Subjects with FHRA were more likely to be female and have TMD symptomatology according to HDI. As a result of the multivariate linear regression model, we identified that subjects with FHRA had lower values of RMS and MNF. Table 1
Conclusions: Findings suggest that the EMG alterations such as lower muscle force and higher muscle fatigue may indicate subtle subclinical arthritic alterations before RA is diagnosed. Electromyography analysis of RMS/MNF in subjects with FHRA is a useful tool to identify differences between groups and can be used as an alternative technique for clinicians.
Methods: We conducted a cross-sectional study with a convenience sample. Sociodemographic, clinical and Helkimo dysfunction index (HDI) information was recorded. Bilateral surface electromyography of masseter muscles was performed, and isometric contraction was recorded for 30 seconds. The RMS/MNF were computed and an average value for each side was obtained. The EMG system that was used was “Electromiógrafo 1.0 UNAM-CINVESTAV-IPN” a system that we developed. We recorded and analyzed the surface EMG activity of both groups and performed a multivariate regression analysis to adjust for other confounders and considering each patient as a cluster unit.
Results: We analyzed 60 adults (mean age 27, S.D.9.29). 30% were identified with FHRA. Subjects with FHRA were more likely to be female and have TMD symptomatology according to HDI. As a result of the multivariate linear regression model, we identified that subjects with FHRA had lower values of RMS and MNF. Table 1
Conclusions: Findings suggest that the EMG alterations such as lower muscle force and higher muscle fatigue may indicate subtle subclinical arthritic alterations before RA is diagnosed. Electromyography analysis of RMS/MNF in subjects with FHRA is a useful tool to identify differences between groups and can be used as an alternative technique for clinicians.