| The distribution of blood flow in the carotid and vertebral arteries during dynamic exercise in humans. | |
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MedLine Citation:
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PMID: 21486813 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The mechanism underlying the plateau or relative decrease in cerebral blood flow (CBF) during maximal incremental dynamic exercise remains unclear. We hypothesized that cerebral perfusion is limited during high intensity dynamic exercise due to a redistribution of carotid artery blood flow. To identify the distribution of blood flow among the arteries supplying the head and brain, we evaluated common carotid artery (CCA), internal carotid artery (ICA), external carotid artery (ECA) and vertebral artery (VA) blood flow during dynamic exercise using Doppler ultrasound. Ten subjects performed graded cycling exercise in a semi-supine position at 40%, 60%, and 80% of peak oxygen uptake (VO2peak) for 5 min at each workload. The ICA blood flow increased by 23.0% (4.6%) [mean (SE)] from rest to exercise at 60%VO2peak. However, at 80%VOpeak, ICA blood flow returned towards near resting levels [9.6% (4.7%) vs. rest]. In contrast, ECA, CCA, and VA blood flow increased proportionally with workload. The change in ICA blood flow during graded exercise was correlated with end-tidal partial pressure of carbon dioxide (CO2) (r = 0.72). The change in ICA blood flow from 60%VO2peak to 80%VO2peak was negatively correlated with the change in ECA blood flow (r = -0.77). Moreover, there was a significant correlation between forehead cutaneous vascular conductance and ECA blood flow during exercise (r = 0.79). These results suggest that during high intensity dynamic exercise the plateau or decrease in ICA blood flow is partly due to a large increase in ECA blood flow, which is selectively increased to prioritize thermoregulation. |
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Authors:
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Kohei Sato; Shigehiko Ogoh; Ai Hirasawa; Anna Oue; Tomoko Sadamoto |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-3-28 |
Journal Detail:
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Title: The Journal of physiology Volume: - ISSN: 1469-7793 ISO Abbreviation: - Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-4-13 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0266262 Medline TA: J Physiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Research Institute of Physical Fitness, Japan Women's College of Physical Education; |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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