| Responses of the trunk to multidirectional perturbations during unsupported sitting in normal adults. | |
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MedLine Citation:
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PMID: 20841625 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Understanding how the human body responds to unexpected force perturbations during quiet sitting is important to the science of motor behavior and the design of neuroprostheses for sitting posture. In this study, the performance characteristics of the neck and trunk in healthy individuals were assessed by measuring the kinematic responses to sudden, unexpected force perturbations applied to the thorax. Perturbations were applied in eight horizontal directions. It was hypothesized that displacement of the trunk, settling time and steady-state error would increase when the perturbation direction was diagonal (i.e., anterior-lateral or posterior-lateral) due to the increased complexity of asymmetrical muscle responses. Perturbation forces were applied manually. The neck and trunk responded in a synchronized manner in which all joints achieved peak displacement simultaneously then returned directly to equilibrium. Displacement in the direction of perturbation and perpendicular to the direction of perturbation were both significantly greater in response to diagonal perturbations (p<.001). The center of mass returned to equilibrium in 3.64±1.42 s after the onset of perturbation. Our results suggest that the trunk sometimes behaves like an underdamped oscillator and is not controlled by simple stiffness when subjected to loads of approximately 200 N. The results of this study are intended to be used to develop a neuroprosthesis for artificial control of trunk stability in individuals with spinal cord injury. |
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Authors:
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T Adam Thrasher; Vivian W Sin; Kei Masani; Albert H Vette; B Cathy Craven; Milos R Popovic |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of applied biomechanics Volume: 26 ISSN: 1065-8483 ISO Abbreviation: J Appl Biomech Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-09-15 Completed Date: 2010-11-02 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9315240 Medline TA: J Appl Biomech Country: United States |
Other Details:
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Languages: eng Pagination: 332-40 Citation Subset: IM |
Affiliation:
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University of Houston, Department of Health and Human Performance, Houston, TX, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Analysis of Variance Biomechanics Humans Imaging, Three-Dimensional Male Muscle Contraction / physiology Muscle, Skeletal / physiology* Postural Balance / physiology* Posture / physiology* Thorax / physiology* |
| Grant Support | |
ID/Acronym/Agency:
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129179//Canadian Institutes of Health Research |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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