An exploratory study on the impact of static and dynamic sitting postures on
lumbar and pelvic mobility during visual display terminal work |
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| Authors: | Hironori Tanoue Toshitaka Mitsuhashi Shunji Sako Ryoichi Inaba |
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| Affiliation: | 1) Department of Rehabilitation, Aichi Koseiren Asuke Hospital: 20 Nakata, Yagami-cho, Toyota-shi, Aichi-ken 444-2351, Japan;2) Nishimikawa Home Nursing Station, Japan;3) Department of Physical Therapy, Nagoya Isen School Corporation Vocational College, Japan;4) Department of Occupational Health, Graduate School of Medicine, Gifu University, Japan |
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| Abstract: | [Purpose] Limited studies exist on the impact of sustained work at a visual display terminal (VDT) on the position and motion of the pelvis and lumbar spine. We evaluated the changes in movement of the lumbar column and pelvis during VDT work. [Participants and Methods] We evaluated the sitting posture of 20 healthy adults while they performed VDT work. The effects of the sitting posture on lumbo-pelvic position and motion were captured using a three-dimensional accelerometer. Between-posture effects of VDT work were evaluated using an analysis of variance (ANOVA). A two-way ANOVA was used to assess the root mean square (RMS) values of the 80-min VDT work period for each posture. A one-way ANOVA was used to evaluate pre- and post-work changes in RMS values during the finger floor distance test (FFD). [Results] People in the dynamic sitting balance chair (DSBC)-based posture demonstrated significantly higher pelvic RMS values than those in reclining and upright sitting postures. The DSBC-based posture was also associated with significantly higher pre- and post-work lumbar and pelvic RMS values during the FFD than in the reclining and upright sitting postures. [Conclusion] The dynamic balance chair may be an effective method of establishing a pattern of spinal exercise during prolonged sitting.Key words: Dynamic sitting posture, Visual display terminal, Acceleration sensor |
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