Retinal blood flow autoregulation after dynamic exercise in healthy young subjects.
Ophthalmologica
; 221(3): 180-5, 2007.
Article
en En
| MEDLINE
| ID: mdl-17440280
ABSTRACT
PURPOSE:
To evaluate the retinal blood flow before and after the increase in systemic blood pressure to assess the autoregulation in healthy young subjects.METHODS:
Twenty eyes of 20 healthy volunteers were examined. The retinal blood flow was assessed by a Heidelberg retina flowmeter (HRF), while the systemic pressure was assessed by a portable electronic sphygmomanometer. Furthermore intraocular pressure (IOP) was always measured by a Goldmann tonometer immediately after HRF assessments. All measurements of physiological and flow parameters were performed with the subjects seated at rest and then immediately after stair climbing.RESULTS:
The IOP decreased significantly after dynamic exercise, while the heart rate and the systemic artery pressure increased significantly. At the baseline, the mean retinal blood flow was 276.8 +/- 80.7 arbitrary units (AU) in the superotemporal area, 243.4 +/- 63.68 AU in the superonasal area, 258.2 +/- 67.37 AU in the inferotemporal area and 243.9 +/- 72.24 AU in the inferonasal area. After dynamic exercise the mean retinal blood flow was 249.8 +/- 86.78 AU in the superotemporal area, 248.7 +/- 63.87 AU in the superonasal area, 245.4 +/- 83.85 AU in the inferotemporal area and 228.8 +/- 62.53 AU in the inferonasal area. No significant change in retinal blood flow was found.CONCLUSION:
Our data support the hypothesis that in normal subjects autoregulation is sufficient to compensate the increase in blood pressure and maintain a stable retinal blood flow after exercise.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Retina
/
Vasos Retinianos
/
Velocidad del Flujo Sanguíneo
/
Ejercicio Físico
Límite:
Adult
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
Ophthalmologica
Año:
2007
Tipo del documento:
Article
País de afiliación:
Italia