Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-2041
Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Physiological motion axis for the seat of a dynamic office chair
Authors: Kuster, Roman
Bauer, Christoph
Oetiker, Sarah
Kool, Jan
DOI: 10.21256/zhaw-2041
10.1177/0018720816646508
Published in: Human Factors
Volume(Issue): 58
Issue: 6
Page(s): 886
Pages to: 898
Issue Date: May-2016
Publisher / Ed. Institution: Sage
ISSN: 0018-7208
1547-8181
Language: English
Subjects: Active sitting; Biomechanics; Dynamic office seat; Kinematics; Low back; Measures; Motion axis; Occupational sitting; Physical ergonomics; Spine; Biomechanical Phenomena; Humans; Posture; Spine; Ergonomics; Motion; Workplace
Subject (DDC): 610: Medicine and health
620: Engineering
Abstract: Objective: The aim of this study was to determine and verify the optimal location of the motion axis (MA) for the seat of a dynamic office chair. Background: A dynamic seat that supports pelvic motion may improve physical well-being and decrease the risk of sitting-associated disorders. However, office work requires an undisturbed view on the work task, which means a stable position of the upper trunk and head. Current dynamic office chairs do not fulfill this need. Consequently, a dynamic seat was adapted to the physiological kinematics of the human spine. Method: Three-dimensional motion tracking in free sitting helped determine the physiological MA of the spine in the frontal plane. Three dynamic seats with physiological, lower, and higher MA were compared in stable upper body posture (thorax inclination) and seat support of pelvic motion (dynamic fitting accuracy). Spinal kinematics during sitting and walking were compared. Results: The physiological MA was at the level of the 11th thoracic vertebra, causing minimal thorax inclination and high dynamic fitting accuracy. Spinal motion in active sitting and walking was similar. Conclusion: The physiological MA of the seat allows considerable lateral flexion of the spine similar to walking with a stable upper body posture and a high seat support of pelvic motion. Application: The physiological MA enables lateral flexion of the spine, similar to walking, without affecting stable upper body posture, thus allowing active sitting while focusing on work.
URI: https://digitalcollection.zhaw.ch/handle/11475/8901
Fulltext version: Published version
License (according to publishing contract): CC BY-NC 3.0: Attribution - Non commercial 3.0 Unported
Departement: School of Health Sciences
Appears in collections:Publikationen Gesundheit

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