Determination of electrode positioning for surface electromyography of the internal oblique muscle using ultrasound imaging

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  • 表面筋電図における内腹斜筋に対する電極位置の検討
  • ヒョウメンキンデンズ ニ オケル ナイ フク シャキン ニ タイスル デンキョク イチ ノ ケントウ

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Abstract

<p>The internal oblique muscle (IO) shows different muscle fiber orientations. Therefore, the purpose of this study was to examine the muscle fiber orientations of the IO and the external oblique muscle (EO) using ultrasound imaging. The subjects were 12 healthy males (mean age, 24.3 years). Initially, five points were determined. For the five points, the inferior margin of the eighth rib was defined as point A and the point below, 2 cm from the anterior superior iliac spine (ASIS), was defined as point E. Then, the point one-fourth of the head side of line AE was defined as point B, the midpoint of the line, as point C, and the point one-fourth of the caudal side of line AE, as point D. Next, a line parallel to the line AE was drawn 1 cm on the outside, and 1 and 2 cm on the inside of the line AE. Finally, ultrasound imaging was performed along each of these four lines. In all subjects, EO was present at point A regardless of the distance from ASIS, and IO was absent. At points B and C, IO and EO were present in all subjects regardless of the distance from ASIS. At point D, IO was present in all subjects regardless of the distance from ASIS, and the number of subjects with EO decreased as the distance from ASIS increased. At point E, the number of subjects with IO increased as the distance from ASIS increased, and EO was absent in all subjects regardless of the distance from ASIS. The results of this study suggest that the electrode position for the oblique fibers of IO should be 2 cm above and 2 cm inside ASIS. In addition, they also suggest that the electrode position for the transverse fibers of IO should be 2 cm below and 4 cm inside ASIS.</p>

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