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. 2014 Mar 12;13:27. doi: 10.1186/1475-925X-13-27

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Copyright © 2014 Yoshioka et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Typical examples of STS movements from the seat heights of six different heights (10, 20, 30, 40, 50 and 60 cm). Time = 0 (%) indicates the instance when the buttocks lost contact with the chair (seat-off time). Time = 100 (%) indicates the finish time of each STS movement. Stick figures were drawn at 10% time intervals. The gap between the center of hip joint and the surface of chair seat is due to the existence of the thickness between the center of hip joint and the skin surface of buttocks.