Abstract
Introduction The study was to see whether there were differences in values of facial surface electromyography in subjects of good heath by muscles, age, and sex. Methods It draws ratio between lower value and higher value (R-LV/HV) and asymmetry index (AI), based on root mean square (RMS) from measurement of facial surface electromyography (sEMG) in 154 people of healthy people (male:female = 70:84) aging between more than 20 and less than 70. Results For R-LV/HV, it averages 81.70±14.60% on frontalis muscle, 73.74±19.12% on zygomaticus muscle, and 79.72±14.77% on orbicularis oris muscle. With analysis of the AI average was 10.87±10.14% on frontalis muscle, 16.71±14.79% on zygomaticus muscle, and 12.10±10.05% on orbicularis oris muscle. Both values were statistically significant in three parts of muscles as shown. Both of R-LV/HV and AI show no statistically significant difference on age and sex (p>0.05). Conclusions It could provide basic data for the future diagnosis of facial nerve palsy patients by measuring facial sEMG values for healthy people.
Highlights
The study was to see whether there were differences in values of facial surface electromyography in subjects of good heath by muscles, age, and sex
Diagnostic techniques for patients with facial paralysis include House-Brackmann scale, Yanagihara grading system, and Sunnybrook facial grading system, which were performed on naked eyes [5, 6], and digital infrared thermal imaging, or DITI, electroneurography (ENoG), nerve excitability test (NET) or electromyography (EMG), and surface electromyography were utilized as diagnostic instruments [7]
SEMG has been widely used as an assessing instrument of facial paralysis and was an index that has significance in determining facial states and degree of recovery with ratio between lower value and higher value(R-LV/HV), or asymmetry index (AI) [8]
Summary
The study was to see whether there were differences in values of facial surface electromyography in subjects of good heath by muscles, age, and sex. It draws ratio between lower value and higher value (R-LV/HV) and asymmetry index (AI), based on root mean square (RMS) from measurement of facial surface electromyography (sEMG) in 154 people of healthy people (male:female = 70:84) aging between more than 20 and less than 70. With analysis of the AI average was 10.87±10.14% on frontalis muscle, 16.71±14.79% on zygomaticus muscle, and 12.10±10.05% on orbicularis oris muscle Both values were statistically significant in three parts of muscles as shown. It could provide basic data for the future diagnosis of facial nerve palsy patients by measuring facial sEMG values for healthy people. SEMG has been widely used as an assessing instrument of facial paralysis and was an index that has significance in determining facial states and degree of recovery with ratio between lower value and higher value(R-LV/HV), or asymmetry index (AI) [8]
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