Relationship between Sitting Pressure Deviation and Trunk Lateral Flexion

Abstract

[Purpose] To examine the relationship between sitting pressure and lateral bending of the trunk by categorizing sitting pressure as greater on one side. [Participants and Methods] The participants were 20 healthy adult males: 10 put pressure on the right side, and 10 put pressure on the left side. Sitting pressure was measured with a floor reaction force meter. The lateral inclinations of the upper and lower trunk were measured with Kinovea software and compared, and the correlation between sitting pressure and lateral inclination of the trunk was determined. [Results] The left side sitting pressure group showed a difference in the left and right trunk lateral flexion angles between the upper trunk and the lower trunk (p＜0.05). A significant correlation was shown between the right sitting pressure group and the right bending angle of the lower trunk, and the right sitting pressure group and the left bending angle of the upper trunk (| r |＝－0.7～－0.65). The left sitting pressure group showed a significant correlation with the left and right trunk lateral flexion angles in the upper trunk (| r |＝－0.65～0.82). [Conclusion] Leaning to the side where one puts more pressure when sitting causes greater bending of the upper trunk; leaning to the opposite side causes bending of the lower trunk.