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Trunk muscle activity with different sitting postures and pelvic inclination
Masahiro Watanabe1, Koji Kaneoka2, Yusuke Wada3
1Department of Physical Therapy, Faculty of Medical and Health Sciences, Tsukuba International University, Ibaraki, Japan.
Journal of Back and Musculoskeletal Rehabilitation
|June 6, 2014
Summary
Sitting on a stable seat with pelvic inclination increases trunk muscle activity and may cause low back pain. Unstable seats reduce muscle imbalance, potentially preventing pain.
Area of Science:
- Biomechanics
- Ergonomics
- Musculoskeletal health
Background:
- Trunk muscle activity during sitting is not well understood.
- Prolonged sitting can burden trunk muscles.
- Understanding posture's effect on low back pain is crucial.
Purpose of the Study:
- To evaluate trunk muscle activity differences between stable and unstable sitting postures.
- To investigate the relationship between pelvic inclination and low back pain.
- To clarify trunk muscle engagement during prolonged sitting.
Main Methods:
- Experiment involving subjects sitting on stable and unstable seats.
- Pelvic inclination varied in forward, backward, rightward, and leftward directions.
- Electromyography used to measure trunk muscle activity.
Main Results:
- Significant increase in trunk muscle activity with pelvic inclination on a stable seat.
- No significant muscle activity increase observed on an unstable seat across all pelvic inclinations.
- Imbalanced muscle activity noted with pelvic inclination on a stable seat.
Conclusions:
- Pelvic inclination on a stable seat leads to imbalanced trunk muscle activity.
- Sitting on an unstable seat with pelvic inclination does not cause muscle imbalance.
- Imbalanced muscle activity from stable-seat sitting may induce low back pain.
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