| Contingent negative variation and activation of postural preparation before postural perturbation by backward floor translation at different initial standing positions. | |
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MedLine Citation:
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PMID: 21185354 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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We investigated the effects of balance difficulty on contingent negative variation (CNV) and postural preparation against perturbation. Thirteen subjects were perturbed by a backward floor translation (S2) after an auditory warning stimulus. To alter balance difficulty, subjects maintained standing posture from four initial positions before perturbation. The position of the center of pressure in the anteroposterior direction (CoPy) was expressed as a percentage distance of foot length (%FL) from the heel: 10%FL anterior to extreme backward leaning; quiet standing (QS); and 20%FL and 10%FL posterior to extreme forward leaning. CNV, CoPy, and electromyography (EMG) of the lower leg muscles were analyzed. Balance difficulty was represented by the relative distance of the forward peak position of CoPy after S2 from the QS position. Balance difficulty was higher with a more anterior initial position. The late CNV peaked just before S2 (latency: -76 to -306ms), then started becoming small. CNV peak was earlier and larger with increasing balance difficulty. CoPy backward shift and a continuous EMG increase were observed as the strategy for postural preparation, and were significantly earlier (61ms and 42ms, respectively) than the CNV peak. CNV peak time correlated closely with onset times of CoPy backward shift (r=0.78) and continuous EMG increase (r=0.71). These findings suggest that as balance difficulty increases, attentional allocation to sensory information and/or postural preparation starts earlier just before the perturbation. |
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Authors:
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Katsuo Fujiwara; Naoe Kiyota; Kaoru Maeda |
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Publication Detail:
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Type: Journal Article Date: 2010-12-23 |
Journal Detail:
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Title: Neuroscience letters Volume: 490 ISSN: 1872-7972 ISO Abbreviation: Neurosci. Lett. Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-02-01 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7600130 Medline TA: Neurosci Lett Country: Ireland |
Other Details:
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Languages: eng Pagination: 135-9 Citation Subset: IM |
Copyright Information:
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Copyright © 2010 Elsevier Ireland Ltd. All rights reserved. |
Affiliation:
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Department of Human Movement and Health, Graduate School of Medical Science, Kanazawa University, 13-1 Takara-machi, Kanazawa 920-8640, Japan. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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