Document Detail


Blood flow velocity in the common carotid artery in humans during graded exercise on a treadmill.
MedLine Citation:
PMID:  7607198     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Cerebral blood volume flow and flow velocity have been reported to increase during dynamic exercise, but whether the two increase in parallel and whether both increases occur as functions of exercise intensity remain unsettled. In this study, blood flow velocity in the common carotid artery was measured using the Doppler ultrasound method in eight healthy male students during graded treadmill exercise. The exercise consisted of stepwise progressive increases and decreases in exercise intensity. The peak intensity corresponded to approximately 85% of maximal oxygen consumption. During this exercise, the heart rate (fc), mean blood pressure (BP) in the brachial artery and mean blood flow velocity (vcc) in the common carotid artery increased as functions of exercise intensity. At the peak exercise intensity, fc, BP and vcc increased by 134.5%, 20.5% and 51.8% over the control levels before exercise (P < 0.01), respectively. The resistance index (RI) and pulsatility index (PI) were determined from the velocity profile and were expected to reflect the distal cerebral blood flow resistance. The RI and PI increased during the graded exercise, but tended to decrease at the highest levels of exercise intensity. As vcc increased with increases in exercise intensity it would be expected that cerebral blood flow would also increase at these higher intensities. It is also suggested that blood flow velocity in the cerebral artery does not proportionately reflect the cerebral blood flow during dynamic exercise, since the cerebral blood flow resistance changes.
Authors:
Z L Jiang; H Yamaguchi; H Tanaka; A Takahashi; S Tanabe; N Utsuyama; T Ikehara; K Hosokawa; Y Kinouchi; H Miyamoto
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  European journal of applied physiology and occupational physiology     Volume:  70     ISSN:  0301-5548     ISO Abbreviation:  Eur J Appl Physiol Occup Physiol     Publication Date:  1995  
Date Detail:
Created Date:  1995-08-11     Completed Date:  1995-08-11     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0410266     Medline TA:  Eur J Appl Physiol Occup Physiol     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  234-9     Citation Subset:  IM    
Affiliation:
Department of Physiology, School of Medicine, University of Tokushima, Japan.
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MeSH Terms
Descriptor/Qualifier:
Blood Flow Velocity / physiology*
Blood Pressure
Carotid Artery, Common / physiology*
Cerebrovascular Circulation / physiology*
Exercise / physiology*
Heart Rate
Humans
Male
Oxygen Consumption
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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