The renin-angiotensin system is modulated by swimming training depending on the age of spontaneously hypertensive rats

The renin-angiotensin system is modulated by swimming training depending on the age of spontaneously hypertensive rats

Author Zamo, Fernanda de Souza Autor UNIFESP Google Scholar
Barauna, Valério Garrone Google Scholar
Chiavegatto, Silvana Google Scholar
Irigoyen, Maria Cláudia Autor UNIFESP Google Scholar
Oliveira, Edilamar Menezes de Google Scholar
Institution Universidade de São Paulo (USP)
Universidade Federal de São Paulo (UNIFESP)
Abstract Aim: To investigate the effects of swimming training on the renin-angiotensin system (RAS) during the development of hypertensive disease.Main methods: Male spontaneously hypertensive rats (SHR) were randomized into: sedentary young (SY), trained young (TV), sedentary adult (SA), and trained adult (TA) groups. Swimming was performed 5 times/wk/8wks.Key findings: Trained young and adult rats showed both decreased systolic and mean blood pressure, and bradycardia after the training protocol. the left ventricular hypertrophy (LVH) was observed only in the TA group (12.7%), but there was no increase on the collagen volume fraction. Regarding the components of the RAS, TV showed lower activity and gene expression of angiotensinogen (AGT) compared to SY. the TA group showed lower activity of circulatory RAS components, such as decreased serum ACE activity and plasma renin activity compared to SA. However, depending on the age, although there were marked differences in the modulation of the RAS by training, both trained groups showed a reduction in circulating angiotensin II levels which may explain the lower blood pressure in both groups after swimming training.Significance: Swimming training regulates the RAS differently in adult and young SHR rats. Decreased local cardiac RAS may have prevented the LVH exercise-induced in the TV group. Both groups decreased serum angiotensin II content, which may, at least in part, contribute to the lowering blood pressure effect of exercise training. (C) 2011 Elsevier Inc. All rights reserved.
Keywords Exercise
Cardiac hypertrophy
Hypertension
Renin-angiotensin system
Blood pressure
Language English
Date 2011-07-18
Published in Life Sciences. Oxford: Pergamon-Elsevier B.V., v. 89, n. 3-4, p. 93-99, 2011.
ISSN 0024-3205 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 93-99
Origin http://dx.doi.org/10.1016/j.lfs.2011.05.004
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000292624300005
URI http://repositorio.unifesp.br/handle/11600/33889

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