| Effects of lower body positive pressure on muscle sympathetic nerve activity response [correction of respopnse] to head-up tilt. | |
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MedLine Citation:
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PMID: 12650184 Owner: NASA Status: MEDLINE |
Abstract/OtherAbstract:
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The benefits of lower body positive pressure (LBPP) are generally accepted for clinical treatment in medical emergencies caused by massive bleeding to maintain the systemic blood pressure. They are also used by NASA post spaceflight for preventing orthostatic hypotension in the astronauts. However, controversy still exists concerning the mechanisms underlying LBPP benefits. The purpose of this study was to test the hypothesis that the baroreflex-mediated enhancement in sympathetic activity would be attenuated by LBPP during an orthostatic challenge in humans. Specifically, we studied 1) the sympathetic activity responses by the microneurographic technique, using direct intraneural measurement of muscle sympathetic nerve activity (MSNA); and 2) the contributions of preload and afterload to the chances in MSNA response during orthostasis on application of LBPP. To accomplish these issues, MSNA was recorded microneurographically along with noninvasive measurement of the cardiovascular variables in all the subjects during exposure to a 70 degrees HUT with 30-mm Hg LBPP. |
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Authors:
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Q Fu; S Iwase; Y Niimi; A Kamiya; J Kawanokuchi; J Cui; T Mano |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of gravitational physiology : a journal of the International Society for Gravitational Physiology Volume: 8 ISSN: 1077-9248 ISO Abbreviation: J Gravit Physiol Publication Date: 2001 Jul |
Date Detail:
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Created Date: 2003-03-21 Completed Date: 2003-09-05 Revised Date: 2007-11-15 |
Medline Journal Info:
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Nlm Unique ID: 9437868 Medline TA: J Gravit Physiol Country: United States |
Other Details:
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Languages: eng Pagination: P83-4 Citation Subset: S |
Affiliation:
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Department of Autonomic Neuroscience, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Baroreflex / physiology* Blood Pressure Heart Rate Hemodynamics / physiology* Humans Lower Body Negative Pressure* Male Muscles / innervation, physiology* Posture / physiology Pulse Stroke Volume Supine Position Sympathetic Nervous System / physiology* Vascular Resistance |
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