A Study of Surface Electromyography Measurement of Orbicularis oris motion in Healthy People※

Objectives : To find an acupuncture point where more exact Surface Electromyography(SEMG) measurement can be drown, through the study of measurement of orbicularis oris. Methods : Of healthy people from 19 to 40 years of age, who did not fall under exclusion criteria (22 males and 22 females), were selected as subjects, after relaxation for 10 minutes, and they were told how to pronounce ‘O’ and ‘U’ with their lips puckered. The SEMG figures were measured with attaching disposable electrode on acupuncture point of right-and-left Hwaryo(LI19) and 1 cun away from Seungjang(CV24) on both sides when the subjects pronounced ‘O’ and ‘U’. Results : The average value was highest on left 1 cun away from Seungjang(CV24) in pronouncing ‘O’ and ‘U’, and the average SEMG value was higher in the order of right 1 cun away from Seungjang(CV24), right Hwaryo(LI19), left Hwaryo(LI19). Average of the lower orbicularis oris is statistically higher than that of the upper orbicularis oris, which has significant meaning. However, there was no significant difference when compared by pronunciation. Average of percentage mark of differences of right-and-left measured value of each pronunciation and each acupuncture point : Pronounced ‘O’ and the upper part of orbicularis oris: 16.76 ± 11.29 %, pronounced ‘O’ and the lower part of orbicularis oris: 22.41 ± 12.92 %, pronounced ‘U’ and the upper part of orbicularis oris: 17.10 ± 9.89 %, pronounced ‘U’ and the lower part of orbicularis oris : 19.20 ± 10.82 %. Conclusion : The difference of pronunciation will not affect the results in SEMG measurement. In addition, the average of the lower orbicularis oris is statistically and significantly higher than that of the upper orbicularis oris.