Hypertension Clinical Trial
Official title:
Autonomic Regulation of Blood Pressure in Premature and Early Menopausal Women
This is a cross-sectional study in which the investigators will determine the impact of premature/early menopause on MSNA, BP and baroreflex sensitivity in younger (≤49 yr old) and older (≥50 yr old) women. Specifically, aim one will determine mechanisms driving autonomic dysregulation of BP in premature and early menopausal women and aim two will determine mechanisms driving autonomic dysregulation of BP in older menopausal women. The study design outlined below will permit testing of aim one and aim two.
Aim One: Determine mechanisms driving autonomic dysregulation of blood pressure (BP) in premature and early menopausal women. Because sympathetic activity and baroreflex function are important contributors for autonomic support of BP regulation, these two mechanisms will be assessed in premature and early menopausal women who are ≤49 yr old. To specifically identify the influence of menopause, these women will be compared to age-matched premenopausal women. The primary hypothesis is that there is greater resting sympathetic activity and blunted baroreflex function in premature and early menopausal women compared with age-matched premenopausal women. The secondary hypothesis is that BP and sympathetic reactivity will be greater in premature and early menopausal compared with age-matched premenopausal women when the sympathetic nervous system is challenged with a stressor. Aim Two: Determine mechanisms driving autonomic dysregulation of BP in older menopausal women. Because older age contributes to risk of CVD, it is imperative to assess the long-term effects of premature and early menopause in older (≥50 yr) women. To determine the impact of the premature loss of sex hormones on cardiovascular physiology, women whom have lived without functioning ovaries for >10 yr will be compared to age-matched women who entered menopause at a typical age. The primary hypothesis is that resting sympathetic activity is greater and baroreflex function is attenuated in women who experience premature or early menopause compared with typically-aged menopausal women. The secondary hypothesis is that BP and sympathetic reactivity will be greater in premature and early compared with typically-aged menopausal women when the sympathetic nervous system is challenged with a stressor. ;
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