| Feed-forward changes in carotid blood flow velocity during active standing. | |
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MedLine Citation:
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PMID: 20970481 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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Orthostatic changes induce temporary loss of circulatory regulation. Feedback systems react to cardiovascular alterations to compensate for the instability. To clarify the existence of anticipatory cardiovascular regulation during active standing, we continuously recorded blood flow velocity (BFV) in the common carotid artery and cerebral blood volume (CBV) in healthy men. The maximum BFV value decreased significantly before standing in the reaction-time condition. The decrease significantly correlated with the change in systolic blood pressure that accompanies upright standing from a supine position. The anticipatory BFV decrease disappeared during self-paced standing, and all BFV parameters significantly declined after the self-paced standing. The CBV recording showed a significant increase in oxyhemoglobin levels before standing in the reaction-time condition. Our study suggests that some feed-forward cardiovascular regulation triggered by central command could be activated before standing, and it may play a functional role in the maintenance of cerebral perfusion during standing. |
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Authors:
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Kazuyoshi Kitaoka; Hajime Miura; Mitsuo Kitamura; Masatake Akutagawa; Yohsuke Kinouchi; Kazuo Yoshizaki |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-10-21 |
Journal Detail:
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Title: Neuroscience letters Volume: 487 ISSN: 1872-7972 ISO Abbreviation: Neurosci. Lett. Publication Date: 2011 Jan |
Date Detail:
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Created Date: 2010-12-20 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: 240-5 Citation Subset: IM |
Copyright Information:
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Copyright © 2010 Elsevier Ireland Ltd. All rights reserved. |
Affiliation:
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Department of Physiology, The University of Tokushima Graduate School, Tokushima 770-8503, Japan. kitaoka@basic.med.tokushima-u.ac.jp |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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