Physical exercise increases middle cerebral artery blood flow velocity.
Neurosurg Rev
; 16(2): 151-6, 1993.
Article
em En
| MEDLINE
| ID: mdl-8345909
ABSTRACT
The effect on the middle cerebral artery blood flow velocity (VMCA) of moderate and hard physical exercise on an ergometer cycle was examined in 10 healthy volunteers using transcranial Doppler sonography (TCD). During exercise, the heart rate increased by 136% and the systolic blood pressure by 37% (mean values). During initial moderate exercise, VMCA increased by 51%; in a following period of maximal physical work, VMCA decreased again by 20% in 9 of 10 volunteers although the heart rate continued to increase by 10% and the systolic blood pressure by 5% (mean values). Constriction of the MCA may explain the initial increase of VMCA, suggesting a role for large cerebral arteries in autoregulation. Our data indicate that the subsequent decrease of VMCA is caused by arteriolar constriction, a likely cause of which was hyperventilation during the excessive work period.
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Base de dados:
MEDLINE
Assunto principal:
Exercício Físico
/
Artérias Cerebrais
Tipo de estudo:
Diagnostic_studies
Limite:
Adult
/
Humans
/
Male
Idioma:
En
Revista:
Neurosurg Rev
Ano de publicação:
1993
Tipo de documento:
Article
País de afiliação:
Suécia