Difference between Right and Left Facial Surface Electromyography in Healthy People
Related Experiment Video
Updated: Feb 5, 2026

Acquisition and Semi-Automated Analysis of Respiratory Muscle Surface Electromyography
Published on: January 24, 2025
Bo-Hyun Kim1, Kyeong Han Kim2, Lak-Hyung Kim3
1Department of Acupuncture & Moxibustion Medicine, College of Korean Medicine, Woosuk University, Republic of Korea.
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.
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