Document Detail


Exercise training associated with estrogen therapy induced cardiovascular benefits after ovarian hormones deprivation.
MedLine Citation:
PMID:  20004069     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Menopause is recognized as a period of increased risk for coronary heart disease. Although the benefits of exercise training in lowering cardiovascular risk factors are well established, the risks and benefits of hormone therapy have been questioned. The purpose of the present study was to investigate the effects of estrogen therapy (HT) associated or not with exercise training (ET) in autonomic cardiovascular control in ovariectomized (OVX) rats. Female rats were divided into: control, OVX, OVX+HT, OVX+ET and OVX+HT+ET. HT was performed using a 0.25mg 8-weeks sustained release pellet. Trained groups were submitted to an 8-week exercise training protocol on treadmill. Baroreflex sensitivity (BRS) was evaluated by heart rate responses to arterial pressure (AP) changes, and vagal and sympathetic tonus by pharmacological blockade. Ovariectomy induced an AP increase (123+/-2mmHg vs. 108+/-2mmHg), BRS impairment ( approximately 69%), sympathetic activation ( approximately 100%) and vagal tonus reduction ( approximately 77%) compared to controls. HT or ET normalized the changes in parasympathetic tonus. However, only the association HT+ET was able to promote normalization of AP, BRS and sympathetic tonus, as compared to controls. These results indicate that ET induces cardiovascular and autonomic benefits in OVX rats under HT, suggesting a positive role of this association in the management of cardiovascular risk factor in postmenopausal women.
Authors:
Karin Flues; Janaina Paulini; Sebasti?o Brito; Iris Callado Sanches; Fernanda Consolim-Colombo; Maria-Cl?udia Irigoyen; K?tia De Angelis
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-12-08
Journal Detail:
Title:  Maturitas     Volume:  65     ISSN:  1873-4111     ISO Abbreviation:  Maturitas     Publication Date:  2010 Mar 
Date Detail:
Created Date:  2010-02-17     Completed Date:  2010-06-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7807333     Medline TA:  Maturitas     Country:  Ireland    
Other Details:
Languages:  eng     Pagination:  267-71     Citation Subset:  IM    
Copyright Information:
Copyright (c) 2009 Elsevier Ireland Ltd. All rights reserved.
Affiliation:
Hypertension Unit, Heart Institute (InCor), University of Sao Paulo Medical School, Sao Paulo, Brazil.
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MeSH Terms
Descriptor/Qualifier:
Animals
Autonomic Nervous System / drug effects*
Baroreflex / drug effects
Blood Pressure / drug effects
Cardiovascular Diseases / prevention & control*
Estrogen Replacement Therapy*
Estrogens / deficiency
Female
Heart Rate / drug effects
Humans
Menopause / physiology*
Ovariectomy
Physical Conditioning, Animal / physiology*
Rats
Rats, Wistar
Risk Factors
Vagus Nerve / drug effects
Chemical
Reg. No./Substance:
0/Estrogens

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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