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J Acupunct Res > Volume 32(3); 2015 > Article
Kim, Lee, Choi, Kim, Yook, Lee, and Kim: A Study of Surface Electromyography Measurement of Wrist Exercise (Extension, Flexion, Grasping) in Healthy People
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This study aimed to prove that surface electromyography(SEMG) can be used to identify the degree of symptoms of diseases in the upper extremities; it also aimed to confirm various potential therapeutic effects through an inquiry into the value measured by the SEMG on certain acupuncture points in the upper extremities.


Fifty healthy people received instructions for the method of exercise: wrist flexion, extension and hand grasping. Disposable electrodes were attached to acupuncture points of Susamni(LI10), Naegwan(PC6), Oegwan(TE5) and below Sohae(HT3) two cun on both sides in flexion, extension and grasping to measure the SEMG values. The research results were analyzed using SPSS statistics Ver. 22.0(IBM, USA).


The average value was highest on Naegwan(PC6) in grasping, and the average SEMG value was higher in the order of grasping, extension and flexion. The asymmetry index of each point was Susamni(LI10) 16.26±13.59 %, Oegwan(TE5) 20.38±15.59 %, below Sohae(HT3) two cun 20.89±16.77 %, Naegwan(PC6) 22.49±14.91 % in wrist extension, Susamni(LI10) 25.99±21.44 %, Oegwan(TE5) 21.15±15.94 %, below Sohae(HT3) two cun 19.62±15.46 %, Naegwan(PC6) 19.93±16.85 % in wrist flexion, Susamni(LI10) 16.60±12.21 %, Oegwan(TE5) 10.94±8.29 %, below Sohae(HT3) two cun 15.20±12.60 %, Naegwan(PC6) 11.68±7.77 % in grasping.


In this study, to identify the degree of symptoms of diseases in the upper extremities and confirm therapeutic effects, it is necessary to analyze the calculated percentage and compare the SEMG measurement of special points with those of other points, and with the asymmetry index.

Fig. 1
Average of SEMG’s root mean square value
Fig. 2
Average of SEMG’s root mean square value(mean) at left wrist extension
Fig. 3
Average of SEMG’s root mean square value(mean) at right wrist extension
Fig. 4
Average of SEMG’s root mean square value(mean) at left wrist flexion
Fig. 5
Average of SEMG’s root mean square value(mean) at right wrist flexion
Fig. 6
Average of SEMG’s root mean square value(mean) at left hand grasping
Fig. 7
Average of SEMG’s root mean square value(mean) at right hand grasping
Table 1
Average of SEMG’s Root Mean Square Value
E-LI10 232.73±116.69
E-TE5 119.37±75.53
E-HT3 below 2 Chon 54.45±47.59
E-PC6 45.96±27.72

F-LI10 64.79±64.08
F-TE5 75.79±56.85
F-HT3 below 2 Chon 172.46±126.41
F-PC6 91.03±69.43

G-LI10 257.07±115.06
G-TE5 171.83±63.43
G-HT3 below 2 Chon 233.77±120.84
G-PC6 294.36±112.94

SD: standard deviation. E: extension. F: flexion. G: grasping.

Table 2
Comparison SEMG’s Root Mean Square Average Between Left and Right (Mean ± SD)
Lt E-LI10 229.04±107.13
E-TE5 131.04±86.41
E-HT3 below 2 Chon 54.74±37.33
E-PC6 49.30±31.09

F-LI10 70.48±74.25
F-TE5 81.50±63.40
F-HT3 below 2 Chon 183.68±140.21
F-PC6 82.70±53.22

G-LI10 247.72±123.25
G-TE5 170.24±68.11
G-HT3 below 2 Chon 227.66±122.18
G-PC6 284.84±113.89

Rt E-LI10 236.42±126.51
E-TE5 107.70±61.49
E-HT3 below 2 Chon 54.16±56.41
E-PC6 42.62±23.72

F-LI10 59.10±52.12
F-TE5 70.08±49.44
F-HT3 below 2 Chon 161.24±111.21
F-PC6 99.36±82.26

G-LI10 266.42±106.68
G-TE5 173.42±59.03
G-HT3 below 2 Chon 239.88±120.42
G-PC6 303.88±112.31
Table 3
Average of Asymmetry Index (Mean ± SD)
E-LI10 16.26±13.59
E-TE5 20.38±15.59
E-HT3 below 2 Chon 20.89±16.77
E-PC6 22.49±14.91

F-LI10 25.99±21.44
F-TE5 21.15±15.94
F-HT3 below 2 Chon 19.62±15.46
F-PC6 19.93±16.85

G-LI10 16.60±12.21
G-TE5 10.94±8.29
G-HT3 below 2 Chon 15.20±12.60
G-PC6 11.68±7.77


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