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The effects of seat height and foot placement on lumbar spine load during sit-to-stand tasks

The effects of seat height and foot placement on lumbar spine load during sit-to-stand tasks The purpose of this study was to determine the influence of seat height and foot position in the sagittal plane on L5-S1 joint load. Fourteen healthy male adults stood up from a chair with three different seat heights and positions of the feet in the sagittal plane. L5-S1 net joint torque, mechanical work, range of motion and electromyographic activity of the erector spinae muscle were measured. L5-S1 net joint work increased by about 50% from high to low seat position. The mean and peak L5-S1 net joint torques increased about 30% from foot-back to foot-neutral position. These results were reinforced by a greater integrated electromyography signal from the erector spinae from high to low seat position and from foot-back to foot-neutral position. A high chair and placement of the feet behind the knees may be advisable to lessen lumbar load during sit-to-stand movements. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ergonomics Taylor & Francis

The effects of seat height and foot placement on lumbar spine load during sit-to-stand tasks

Ergonomics , Volume 57 (11): 9 – Nov 2, 2014
9 pages

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References (27)

Publisher
Taylor & Francis
Copyright
© 2014 Taylor & Francis
ISSN
1366-5847
eISSN
0014-0139
DOI
10.1080/00140139.2014.948495
pmid
25174255
Publisher site
See Article on Publisher Site

Abstract

The purpose of this study was to determine the influence of seat height and foot position in the sagittal plane on L5-S1 joint load. Fourteen healthy male adults stood up from a chair with three different seat heights and positions of the feet in the sagittal plane. L5-S1 net joint torque, mechanical work, range of motion and electromyographic activity of the erector spinae muscle were measured. L5-S1 net joint work increased by about 50% from high to low seat position. The mean and peak L5-S1 net joint torques increased about 30% from foot-back to foot-neutral position. These results were reinforced by a greater integrated electromyography signal from the erector spinae from high to low seat position and from foot-back to foot-neutral position. A high chair and placement of the feet behind the knees may be advisable to lessen lumbar load during sit-to-stand movements.

Journal

ErgonomicsTaylor & Francis

Published: Nov 2, 2014

Keywords: L5-S1 joint; joint work; electromyography; biomechanics

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