Document Detail


Effects of chronic estrogen replacement therapy on beat-to-beat blood pressure dynamics in healthy postmenopausal women.
MedLine Citation:
PMID:  7558235     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Recent data showing gender differences in autonomic control of heart rate and acute estrogen effects on vasodilatation suggest that estrogen may influence autonomic regulation of heart rate and blood pressure. We aimed to determine the effect of postmenopausal estrogen replacement therapy on autonomic control of beat-to-beat heart rate and blood pressure dynamics. Subjects included 20 healthy postmenopausal women aged 60 to 75 years with normal exercise tolerance tests, 10 of whom were taking oral estrogen for 13 +/- 3 (+/- SEM) years. Six healthy premenopausal women were also studied. Continuous electrocardiographic and noninvasive radial artery blood pressure measurements and intermittent forearm blood flow recordings (by venous-occlusion plethysmography) were obtained before and after a 20-minute, 60 degrees head-up tilt and a 420-kcal meal during periods of spontaneous and metronomic breathing (at 0.25 Hz). Low-frequency (0.01- to 0.15-Hz) and high-frequency (0.15- to 0.50-Hz) heart rate and blood pressure spectral powers were compared with a fast Fourier transform. Cardiovascular and heart rate spectral power responses to upright tilt and meal digestion were the same in postmenopausal estrogen users and nonusers. However, during spontaneous breathing the blood pressure spectral power responses to upright tilt and meal ingestion were significantly different between the two groups of women. The low-frequency systolic pressure power response to upright tilt was smaller in estrogen users than nonusers (P = .01). After meal ingestion nonusers had an early postprandial fall (20 to 30 minutes after the meal) and late rise (50 to 60 minutes) in low-frequency systolic and diastolic pressure powers, which were significantly attenuated in estrogen users (P < .02).(ABSTRACT TRUNCATED AT 250 WORDS)
Authors:
L A Lipsitz; C M Connelly; M Kelley-Gagnon; D K Kiely; R J Morin
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Hypertension     Volume:  26     ISSN:  0194-911X     ISO Abbreviation:  Hypertension     Publication Date:  1995 Oct 
Date Detail:
Created Date:  1995-11-07     Completed Date:  1995-11-07     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  7906255     Medline TA:  Hypertension     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  711-5     Citation Subset:  IM; S    
Affiliation:
Hebrew Rehabilitation Center for Aged Research and Training Institute, Beth Israel Hospital Department of Medicine, Boston, MA 02131, USA.
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MeSH Terms
Descriptor/Qualifier:
Aged
Blood Pressure
Cardiovascular Physiological Phenomena
Digestion
Eating
Estrogen Replacement Therapy*
Female
Head-Down Tilt
Heart Rate
Hemodynamics
Humans
Middle Aged
Postmenopause / physiology*
Reference Values
Time Factors
Grant Support
ID/Acronym/Agency:
AGO4390/AG/NIA NIH HHS; AGO8812/AG/NIA NIH HHS; AGO9538/AG/NIA NIH HHS

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


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