Der Einfluß körperlicher Belastung auf die Flußgeschwindigkeit in der Arteria cerebri media
| Autor: | P.-A. Fischer, Th. Briebach, J. Laubenberger |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
medicine.medical_specialty
Cardiac output business.industry Blood flow pCO2 Transcranial Doppler Cerebral circulation Blood pressure medicine.artery Internal medicine Middle cerebral artery Heart rate medicine Cardiology Radiology Nuclear Medicine and imaging Radiology business circulatory and respiratory physiology |
| Zdroj: | Ultraschall in der Medizin. 10:250-253 |
| ISSN: | 1438-8782 0172-4614 |
| DOI: | 10.1055/s-2007-1006002 |
| Popis: | Changes in blood flow velocity of the middle cerebral artery (MCA) were measured by transcranial Doppler Sonography in 10 healthy subjects during a 10-minute period of moderate bicycle exercise. During physical exercise, a marked increase in heart rate (+63%) und ventilation rate (+48%) and a moderate increase in mean arterial blood pressure (+16%) were found. The end tidal carbon dioxide partial pressure rose in all cases by a mean value of 6.7 mmHg. The MCA flow velocity increased from 62 cm/s to 75 cm/s by 13 cm/s or 21% (mean values). When corrected to a standard pCO2 of 40 mmHg no significant changes in flow velocities (-1 cm/s) were found. Our Doppler sonographic findings indicate that during moderate physical exercises the MCA flow velocity - and the cerebral circulation - are regulated by the carbon dioxide partial pressure and not by cardiac output. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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