Autonomic modulation of heart rate of young and postmenopausal women undergoing estrogen therapy.

Autonomic modulation of heart rate of young and postmenopausal women undergoing estrogen therapy. Research Abstract Details 

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Autonomic modulation of heart rate of young and postmenopausal women undergoing estrogen therapy. Abstract Text:

V F C Neves,M F ,L Gallo,A M Catai,L E B Martins,J C ,N M ,E Silva,V F C Neves,M F Silva de Sá,L Gallo,A M Catai,L E B Martins,J C Crescêncio,N M Perpétuo,E Silva,

The aim of the present study was to determine whether estrogen therapy (ET) reduces alterations of the autonomic control of heart rate (HR) due to hypoestrogenism and aging. Thirteen young (24 +/- 2.6 years), 10 postmenopausal (53 +/- 4.6 years) undergoing ET (PM-ET), and 14 postmenopausal (56 +/- 2.6 years) women not undergoing ET (PM) were studied. ET consisted of 0.625 mg/day conjugated equine estrogen. HR was recorded continuously for 8 min at rest in the supine and sitting positions. HR variability (HRV) was analyzed by time (SDNN and rMSSD indices) and frequency domain methods. Power spectral components are reported as normalized units (nu) at low (LF) and high (HF) frequencies, and as LF/HF ratio. Intergroup comparisons: SDNN index was higher in young (median: supine, 47 ms; sitting, 42 ms) than in PM-ET (33; 29 ms) and PM (31; 29 ms) women (P < 0.05). PM showed lower HFnu, higher LFnu and higher LF/HF ratio (supine: 44, 56, 1.29; sitting: 38, 62, 1.60) than the young group in the supine position (61, 39, 0.63) and the PM-ET group in the sitting position (57, 43, 0.75; P < 0.05). Intragroup comparisons: HR was lower in the supine than in the sitting position for all groups (P < 0.05). The HRV decrease from the supine to the sitting position was significant only in the young group. These results suggest that HRV decreases during aging. ET seems to attenuate this process, promoting a reduction in sympathetic activity on the heart and contributing to the cardioprotective effect of estrogen hormones.

Autonomic modulation of heart rate of young and postmenopausal women undergoing estrogen therapy. Publishing Authors By Initials

VF Neves,MF ,L Gallo,AM Catai,LE Martins,JC ,NM ,E Silva,VF Neves,MF Silva de Sá,L Gallo,AM Catai,LE Martins,JC Crescêncio,NM Perpétuo,E Silva,

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Autonomic modulation of heart rate of young and postmenopausal women undergoing estrogen therapy. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Brazilian journal of medical and biological resear

VOLUME: 40

Page Numbers: 491-9

Journal Abbreviation: Braz. J. Med. Biol. Res.

ISSN: 0100-879X

DAY: 2

MONTH: Apr

YEAR: 2007

Autonomic modulation of heart rate of young and postmenopausal women undergoing estrogen therapy. Information

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LANGUAGE: eng

NlmUniqueID: 8112917

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AFFILIATION: Núcleo de Pesquisa em Exercício Físico, Laboratório de Fisioterapia Cardiovascular, Departamento de Fisioterapia, Universidade Federal de São Carlos, São Carlos, SP, Brasil. valeria0208@ig.com.br

Country: Brazil

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MEDLINETA: Braz J Med Biol Res

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