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Comparison Study about Surface Mapping of Motor Points in Biceps Brachii Muscle Using Surface EMG and Electric Probe
J Korean Med Rehabil 2018;28:85-96
Published online January 31, 2018;  https://doi.org/10.18325/jkmr.2018.28.1.85
Copyright © 2018 The Society of Korean Medicine Rehabilitation.

Jaewon Park, K.M.D., Dongho Keum, K.M.D.

Department of Rehabilitation Medicine of Korean Medicine, College of Korean Medicine, Dongguk University
Correspondence to: Dongho Keum, Department of Rehabilitation Medicine of Korean Medicine, College of Korean Medicine, Dongguk University, 268 Buljeong-ro, Bundang-gu, Seongnam 13601, Korea
TEL (031) 710-3728
FAX (031) 710-3780
E-mail keumdh660@naver.com
Received November 7, 2017; Revised November 27, 2017; Accepted December 6, 2017.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Objectives This study was performed to compare the electrical methods of motor points mapping using surface EMG and electric probe (Pointer Excel II).
Methods 32 healthy adults (male 16, female 16) were selected. and classified into two groups; surface EMG group, electric probe (Pointer Excel II) group. In surface EMG group, motor points were searched by recoding the compound muscle potentials. In electric probe (Pointer Excel II) group, motor points were searched by scanning the skin with Pointer Excel II at low level stimulation. The locations of the motor points were expressed as X and Y values in relation to the reference line. The horizontal reference line was set as elbow crease and the vertical reference line was set as the line connecting coracoid process to the center of the horizontal reference line. The data was analyzed by ‘Independent T-test’ and ‘equivalence test’.
Results 1. The motor points of short head and long head of biceps brachii muscle were located at about 2/3 length of the vertical reference line from coracoid process and about 1/5∼1/4 length of the half of the horizontal reference line from the vertical reference line in both group. 2. The motor points of the short head were located more distally and close to the vertical reference line (p<0.001). 3. In surface EMG group, the motor points of the long head were located more laterally in the female than male. And the motor points of the long head were located more distally in the left side than right side (p<0.05). In electric probe (Pointer Excel II) group, similar tendency was observed but there was no statistically significant difference (p>0.05). 4. As a result of the equivalence test between surface EMG group and electric probe (Pointer Excel II) group, the confidence intervals of the difference were within the equivalence limit. Therefore, the locations of the motor points searched by two ways are equa l (p>0.05, equivalence interval=3%).
Conclusions The results indicate that electric probe (Pointer Excel II) can be used to search the motor points instead of surface EMG. This might improve the clinical efficiency when using the motor points to treat muscle dysfunction.
Keywords : Motor Point, Electric probe, Pointer Excel, Surface EMG, Biceps brachii


January 2018, 28 (1)