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Titre: Heart rate variability under resting conditions in postmenopausal and young women
Auteur(s): Marães, Vera Regina Fernandes Silva
Azevedo, George Dantas de
Crescêncio, Júlio César
Ribeiro, Tatiane Flores
Papa, Valeria
Catai, Aparecida Maria
Verzola, Roberto Mário Machado
Oliveira, Lucien de
Sá, Marcos Felipe Silva de
Gallo Júnior, Lourenço
Silva, Ester da
Assunto:: Batimento cardíaco
Menopausa
Coração - doenças
Exercícios físicos
Date de publication: jui-2001
Editeur: Associação Brasileira de Divulgação Científica
Référence bibliographique: RIBEIRO, Tatiane Flores et al. Heart rate variability under resting conditions in postmenopausal and young women. Brazilian Journal of Medical and Biological Research, Ribeirão Preto, v. 34, n. 7, jul. 2001. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000700006&lng=pt&nrm=iso>. Acesso em: 7 nov. 2012. http://dx.doi.org/10.1590/S0100-879X2001000700006.
Résumé: The aim of the present study was to compare the modulation of heart rate in a group of postmenopausal women to that of a group of young women under resting conditions on the basis of R-R interval variability. Ten healthy postmenopausal women (mean ± SD, 58.3 ± 6.8 years) and 10 healthy young women (mean ± SD, 21.6 ± 0.82 years) were submitted to a control resting electrocardiogram (ECG) in the supine and sitting positions over a period of 6 min. The ECG was obtained from a one-channel heart monitor at the CM5 lead and processed and stored using an analog to digital converter connected to a microcomputer. R-R intervals were calculated on a beat-to-beat basis from the ECG recording in real time using a signal-processing software. Heart rate variability (HRV) was expressed as standard deviation (RMSM) and mean square root (RMSSD). In the supine position, the postmenopausal group showed significantly lower (P<0.05) median values of RMSM (34.9) and RMSSD (22.32) than the young group (RMSM: 62.11 and RMSSD: 49.1). The same occurred in the sitting position (RMSM: 33.0 and RMSSD: 18.9 compared to RMSM: 57.6 and RMSSD: 42.8 for the young group). These results indicate a decrease in parasympathetic modulation in postmenopausal women compared to young women which was possibly due both to the influence of age and hormonal factors. Thus, time domain HRV proved to be a noninvasive and sensitive method for the identification of changes in autonomic modulation of the sinus node in postmenopausal women.
Licença:: Brazilian Journal of Medical and Biological Research - Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons (Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0)). Fonte: http://www.scielo.br/scielo.php?script=sci_serial&pid=0100-879X&lng=pt&nrm=iso. Acesso em: 7 nov. 2012.
DOI: http://dx.doi.org/10.1590/S0100-879X2001000700006
Collection(s) :Artigos publicados em periódicos e afins

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