Trunk muscle activity with different sitting postures and pelvic inclination

Masahiro Watanabe, Koji Kaneoka, Yusuke Wada, Yasushi Matsui, Shumpei Miyakawa

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

BACKGROUND AND OBJECTIVE: Sitting posture may often place large burden on trunk muscles, while trunk muscle activities in the sitting posture have not been well clarified. In this study, a difference in trunk muscle activity between two kinds of sitting postures was evaluated, focusing on low back pain induced by posture holding.

MATERIAL AND METHODS: An experiment was conducted on the subjects sitting on a stable-seat and on an unstable-seat, with the pelvis inclined forward, backward, rightward, and leftward.

RESULTS: With the pelvis inclined forward, rightward and leftward, muscle activities were significantly increased in a stable-seat sitting posture. In contrast, no significant increase in muscle activity was observed with the pelvis inclined in every direction in an unstable-seat sitting posture.

CONCLUSIONS: With the pelvis inclined in the stable-seat sitting posture, muscle activities were imbalanced, while with the pelvis inclined in the unstable-seat sitting posture, muscle activities were not imbalanced. Thus, it is suggested that with the pelvis inclined to the maximum extent in the stable-seat sitting posture, low back pain may be induced by imbalanced muscle activities.

Original languageEnglish
Pages (from-to)531-536
Number of pages6
JournalJournal of Back and Musculoskeletal Rehabilitation
Volume27
Issue number4
DOIs
Publication statusPublished - 2014

Keywords

  • Low back pain
  • electromyography
  • pelvis incline
  • posture
  • stable seat
  • trunk muscle
  • unstable seat

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation
  • Rehabilitation

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