Document Detail

Cerebral hemodynamic reactions to low-intensity physical exercise.
MedLine Citation:
PMID:  19517246     Owner:  NLM     Status:  MEDLINE    
Cerebral hemodynamic reactions to light physical exercise increasing stepwise on a bicycle ergometer were studied in healthy young male subjects. Hemodynamic parameters were measured by transcranial Doppler ultrasonography from the middle cerebral artery (MCA) before the start of the study and during the last few seconds of each exercise step. Cerebral hemodynamic reactions to physical exercise were characterized by a significant increase in systolic blood flow rate in the middle cerebral artery only at exercise levels of about 0.25 W/kg body weight (90 rpm at 0 W/kg) with no further increase in the blood flow rate with increases in loading to 0.5 W/kg body weight. The mechanism stabilizing blood flow rate in the cerebral arteries as physical exercise increased and, thus, the mechanism of cerebral circulatory autoregulation consisted of a arterial pressure-dependent increase in regional cerebral vascular resistance. The threshold at which the cerebral blood flow rate autoregulatory mechanism was triggered in normal subjects corresponded to a loading of about 0.25 W/kg and a systolic arterial pressure of about 140-145 mmHg.
V P Kulikov; N L Doronina; K K Gatal'skii
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Publication Detail:
Type:  Journal Article     Date:  2009-06-11
Journal Detail:
Title:  Neuroscience and behavioral physiology     Volume:  39     ISSN:  1573-899X     ISO Abbreviation:  Neurosci. Behav. Physiol.     Publication Date:  2009 Jul 
Date Detail:
Created Date:  2009-06-17     Completed Date:  2009-08-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0330471     Medline TA:  Neurosci Behav Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  581-6     Citation Subset:  IM    
Federal Agency for Health and Social Development, Altai State Medical University, Altai Region, Russia.
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MeSH Terms
Blood Flow Velocity
Cerebrovascular Circulation*
Coronary Circulation

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

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