| Age-related changes in the control of finger force vectors. | |
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MedLine Citation:
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PMID: 20829494 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We explored changes in finger interaction in the process of healthy aging as a window into neural control strategies of natural movements. In particular, we quantified the amount of force produced by noninstructed fingers in different directions, the amount of force produced by the instructed finger orthogonally to the task direction, and the strength of multifinger synergies stabilizing the total force magnitude and direction during accurate force production. Healthy elderly participants performed accurate isometric force production tasks in five directions by individual fingers and by all four fingers acting together. Their data were compared with a dataset obtained in a similar earlier study of young subjects. Finger force vectors were measured using six-component force/torque sensors. Multifinger synergies were quantified using the framework of the uncontrolled manifold hypothesis. The elderly participants produced lower force magnitudes by noninstructed fingers and higher force magnitudes by instructed fingers in nontask directions. They showed strong synergies stabilizing the magnitude and direction of the total force vector. However, the synergy indexes were significantly lower than those observed in the earlier study of young subjects. The results are consistent with an earlier hypothesis of preferential weakening of intrinsic hand muscles with age. We interpret the findings as a shift in motor control from synergic to element-based, which may be causally linked to the documented progressive neuronal death at different levels of the neural axis. |
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Authors:
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Shweta Kapur; Vladimir M Zatsiorsky; Mark L Latash |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, N.I.H., Extramural Date: 2010-09-09 |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 109 ISSN: 1522-1601 ISO Abbreviation: J. Appl. Physiol. Publication Date: 2010 Dec |
Date Detail:
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Created Date: 2010-12-14 Completed Date: 2011-03-25 Revised Date: 2011-12-21 |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 1827-41 Citation Subset: IM |
Affiliation:
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Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Age Factors Aged Aging* Analysis of Variance Biomechanics Female Fingers Humans Isometric Contraction* Male Models, Biological Motor Activity* Muscle Strength* Muscle, Skeletal / innervation, physiology* Task Performance and Analysis Torque Transducers, Pressure |
| Grant Support | |
ID/Acronym/Agency:
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AG-018751/AG/NIA NIH HHS; AR-048563/AR/NIAMS NIH HHS; NS-035032/NS/NINDS NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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