| Cerebral and peripheral hemodynamics and oxygenation during maximal dry breath-holds. | |
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MedLine Citation:
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PMID: 17363344 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The effects of maximal apneas on cerebral and brachial blood flow and oxygenation are unknown in humans. Middle cerebral artery blood velocity (MCAV), cerebral and muscle oxygenation (Sc(O2) and Sm(O2)) and brachial blood flow (BBF) were measured during apneas in breath-hold divers (BHD) and non-divers (ND). Brain oxyhemoglobin (O(2)Hb) was maintained in both groups until the end of apnea, whereas deoxyhemoglobin increased more in BHD. Therefore, Sc(O2) decreased more in BHD due to longer apnea duration and smaller initial MCAV increase. MCAV increased significantly more in BHD versus ND at the end of apnea. Cerebral desaturation for approximately 13% occurred at the end of apnea in BHD despite increased cerebral oxygen delivery for approximately 50%. Larger reduction in muscle O(2)Hb was found in BHD, with similar peripheral vasoconstriction. These data indicate that BHD have decreased Sc(O2) at the end of breath-hold despite large increases in MCAV. This is partly due delayed initial cerebral vasodilation. This study provides further evidence for the oxygen-conserving effect in elite divers. |
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Authors:
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Ivan Palada; Ante Obad; Darija Bakovic; Zoran Valic; Vladimir Ivancev; Zeljko Dujic |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2007-02-08 |
Journal Detail:
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Title: Respiratory physiology & neurobiology Volume: 157 ISSN: 1569-9048 ISO Abbreviation: Respir Physiol Neurobiol Publication Date: 2007 Aug |
Date Detail:
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Created Date: 2007-05-28 Completed Date: 2007-08-02 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101140022 Medline TA: Respir Physiol Neurobiol Country: Netherlands |
Other Details:
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Languages: eng Pagination: 374-81 Citation Subset: IM |
Affiliation:
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Department of Physiology, University of Split School of Medicine, Soltanska 2, 21000 Split, Croatia. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Apnea / physiopathology* Brain / blood supply* Cerebrovascular Circulation* Diving / physiology Heart Rate / physiology Humans Male Middle Cerebral Artery / physiology Muscle, Skeletal / blood supply* Oxygen Consumption / physiology* Oxyhemoglobins / metabolism Regional Blood Flow Respiration* Spectroscopy, Near-Infrared / methods Statistics, Nonparametric Ultrasonography, Doppler, Transcranial / methods |
| Chemical | |
Reg. No./Substance:
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0/Oxyhemoglobins |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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