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http://dx.doi.org/10.5762/KAIS.2017.18.7.476

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

Lee, Won-Hwee (Department of Physical Therapy, Jeonju Vision College)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.18, no.7, 2017 , pp. 476-482 More about this Journal
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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