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Effect of seat height of chair on muscle activity of erector spinae and rectus abdominis

의자 좌면 높이가 척추 세움근과 배곧은근의 근 활성도에 미치는 영향

  • Lee, Won-Hwee (Department of Physical Therapy, Jeonju Vision College)
  • 이원휘 (전주비전대학교 물리치료학과)
  • Received : 2017.05.15
  • Accepted : 2017.07.07
  • Published : 2017.07.31

Abstract

This study examined the effects of the seat height of a chair on the muscle activity of the erector spinae and rectus abdominis. Thirty healthy subjects were asked to sit on chairs at three different seat heights. The muscle activities of both the erector spinae and rectus abdominis were measured by surface electromyography. The data were analyzed by repeated one way ANOVA and the muscle activity was compared according to the seat height. The alpha level was set to 0.05. The results showed that the muscle activities of the erector spinae were not significantly different among the three seat heights. The muscle activities of the rectus abdominis were significantly different among the three seat heights. Both the rectus abdominis muscle activities were significantly greater in the low seat height than the other seat heights. These results showed that the seat height of the chair affects the muscle activities of the rectus abdominis muscle, leading to musculoskeletal pain, such as low back pain. Therefore, the seat height of a chair with a correct sitting position is important for preventing musculoskeletal pain.

Keywords

Chair;Electromyography;Low back pain;Seat height;Sitting position

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