Spontaneous running increases aortic compliance in Wistar-Kyoto rats.
Cardiovasc Res
; 35(1): 132-7, 1997 Jul.
Article
em En
| MEDLINE
| ID: mdl-9302357
ABSTRACT
OBJECTIVE:
Previous studies in humans have found, using non-invasive methodology, that arterial compliance is elevated with exercise training. Forced exercise in animals has corroborated these findings, but the association of this type of exercise with psychological stressors limits its relevance to humans. We have investigated the effects of spontaneous running exercise from 4-20 weeks of age on aortic and mesenteric compliance and vascular reactivity in Wistar-Kyoto (WKY) rats.METHODS:
Animals were killed using CO2 asphyxia and the aorta, mesentery and heart rapidly removed. The heart was dissected and weighed. The aorta was separated into 3 4-mm rings which were mounted on wires in organ baths for determination of compliance and vascular reactivity to noradrenaline, acetylcholine and sodium nitroprusside. The slope of diameter-pressure relationship derived using Laplace's equation was used as an index of compliance.RESULTS:
During the final 2 weeks of training WKY rats ran an average of 7.9 +/- 1.0 km/24 h. Body weight was not affected by training. Training significantly increased the weight of the atria, left and right ventricles as well as total heart weight and left ventricular/body weight ratio. Aortic compliance was increased from 12.3 +/- 0.4 to 14.2 +/- 0.5 microns/mmHg (P < 0.05) after training. There was no effect of training on aortic reactivity to noradrenaline, acetylcholine or sodium nitroprusside.CONCLUSION:
Exercise training increased intrinsic aortic compliance in WKY rats which provides evidence for a structural basis for the elevated compliance reported previously with 4 weeks of aerobic exercise in man.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Aorta
/
Corrida
/
Resistência Vascular
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Revista:
Cardiovasc Res
Ano de publicação:
1997
Tipo de documento:
Article
País de afiliação:
Austrália