Contribution of perfusion pressure to vascular resistance response during head-up tilt.
Am J Physiol Heart Circ Physiol
; 281(1): H371-5, 2001 Jul.
Article
de En
| MEDLINE
| ID: mdl-11406505
ABSTRACT
We measured brachial and femoral artery flow velocity in eight subjects and peroneal and median muscle sympathetic nerve activity (MSNA) in five subjects during tilt testing to 40 degrees. Tilt caused similar increases in MSNA in the peroneal and median nerves. Tilt caused a fall in femoral artery flow velocity, whereas no changes in flow velocity were seen in the brachial artery. Moreover, with tilt, the increase in the vascular resistance employed (blood pressure/flow velocity) was greater and more sustained in the leg than in the arm. The ratio of the percent increase in vascular resistance in leg to arm was 2.51. We suggest that the greater vascular resistance effects in the leg were due to an interaction between sympathetic nerve activity and the myogenic response.
Mots clés
Recherche sur Google
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Résistance vasculaire
/
Pression sanguine
/
Test d'inclinaison
Limites:
Adult
/
Female
/
Humans
/
Male
/
Middle aged
Langue:
En
Journal:
Am J Physiol Heart Circ Physiol
Sujet du journal:
CARDIOLOGIA
/
FISIOLOGIA
Année:
2001
Type de document:
Article
Pays d'affiliation:
États-Unis d'Amérique