| Differential joint coordination in the tasks of standing up and sitting down. | |
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MedLine Citation:
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PMID: 12435546 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We studied similarities and differences in the use of goal-equivalent patterns of joint coordination to stand up and sit down from different support surfaces, performed without vision. Sagittal plane motion of major body segments was measured and joint angles for the left upper and lower extremities and the trunk were calculated. We used a modeling strategy relating motion in the redundant space of the joints to motion of individual performance variables, such as the center of mass (CM) or head, and determined how the variability of joint combinations across trials was structured; i.e. variations in joint combinations leading to a consistent value of a performance variable (goal-equivalent variability) and variations resulting in variability of the performance variable (non goal-equivalent variability). We found the variability of joint combinations to be selectively channeled into goal-equivalent directions, leading to stable horizontal motion of the CM and of the head, during both standing up and sitting down. In contrast, when evaluating the effect of joint combination variability on the control of vertical CM motion, we found differences in the variability components between standing up and sitting down. In general, more variable vertical CM motion occurred. An important finding was an enhanced use of goal-equivalent joint combinations under challenging task conditions, whether standing up or sitting down. |
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Authors:
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Darcy S Reisman; John P Scholz; Gregor Schöner |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology Volume: 12 ISSN: 1050-6411 ISO Abbreviation: J Electromyogr Kinesiol Publication Date: 2002 Dec |
Date Detail:
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Created Date: 2002-11-18 Completed Date: 2003-04-29 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 9109125 Medline TA: J Electromyogr Kinesiol Country: England |
Other Details:
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Languages: eng Pagination: 493-505 Citation Subset: IM |
Affiliation:
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Biomechanics and Movement Science Graduate Program, University of Delaware, Newark, DE 19716, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Biomechanics Female Humans Joints / physiology* Male Movement / physiology* Posture / physiology* Range of Motion, Articular / physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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