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.
Status | Recruiting |
Enrollment | 160 |
Est. completion date | April 30, 2025 |
Est. primary completion date | April 30, 2025 |
Accepts healthy volunteers | Accepts Healthy Volunteers |
Gender | Female |
Age group | 35 Years to 70 Years |
Eligibility | Inclusion Criteria: - Aged 35-49 or 50-70 years of age who experienced premature (<40) or early (=45) menopause - Premenopausal 35-49 years of age - Typical-age menopause (i.e., after 45 years of age), who are between 50-70 years old - Menopause will be confirmed by subject report of amenorrhea for 12 months and serum FSH of >30 mIU/mL Exclusion Criteria: - Current nicotine/tobacco use within the past six months - Are diabetic or asthmatic - Have diagnosed significant carotid stenosis - Have a history of significant autonomic dysfunction, heart disease, respiratory disease or a severe neurologic condition such as stroke or traumatic brain injury. - Have existing metabolic or endocrine abnormities - Take any heart/blood pressure medications that are determined to interfere with study outcomes - IF the participant is premenopausal AND currently taking OC or other exogenous steroids that are determined to interfere with study outcomes - Females who classify as having early or premature menopause AND are not willing to discontinue OC or MHT in order to complete the study - Are pregnant or breastfeeding |
Country | Name | City | State |
---|---|---|---|
United States | University of Minnesota | Minneapolis | Minnesota |
Lead Sponsor | Collaborator |
---|---|
University of Minnesota |
United States,
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | Muscle Sympathetic Nerve Activity (MSNA) (bursts per minute) | Muscle sympathetic nerve activity (MSNA) is a measurement of sympathetic activity. This is measured by two small needles are inserted behind or on the side of the knee, one needle is an acupuncture needle and one needle is a small recording microelectrode (same size as the acupuncture needle). Outcome will be reported in units of bursts per minute. | 3 hours | |
Primary | Muscle Sympathetic Nerve Activity (MSNA) (bursts/100 heart beats) | Muscle sympathetic nerve activity (MSNA) is a measurement of sympathetic activity. This is measured by two small needles are inserted behind or on the side of the knee, one needle is an acupuncture needle and one needle is a small recording microelectrode (same size as the acupuncture needle). Outcome will be reported in units of bursts per 100 heart beats. | 3 hours | |
Primary | Cardiac baroreflex sensitivity | Baroreflex sensitivity will be derived from electrocardiogram measurements and blood pressure measurements during the baseline rest period and by performing a modified valsalva maneuver which involves exhaling against 30-40 mmHg of pressure over 15 seconds after a normal inhalation. Outcome will be reported in units as ms/mmHg. | 3 hours | |
Primary | Sympathetic baroreflex sensitivity | Baroreflex sensitivity will be derived from electrocardiogram measurements and blood pressure measurements during the baseline rest period and by performing a modified valsalva maneuver which involves exhaling against 30-40 mmHg of pressure over 15 seconds after a normal inhalation. Outcome will be reported in units of MSNA bursts/mmHg. | 3 hours | |
Primary | Systolic Blood Pressure (mmHg) | Blood pressure is measured using a non-invasive blood pressure cuff secured to the middle or ring finger and reported in units of mmHg. | 3 hours | |
Primary | Diastolic Blood Pressure (mmHg) | Blood pressure is measured using a non-invasive blood pressure cuff secured to the middle or ring finger and reported in units of mmHg. | 3 hours | |
Primary | Mean Arterial Blood Pressure (mmHg) | Blood pressure is measured using a non-invasive blood pressure cuff secured to the middle or ring finger and reported in units of mmHg. | 3 hours | |
Primary | Heart Rate (beats/min) | Heart rate will be measured with a three-lead electrocardiogram (ECG) and reported in units of beats/min. | 3 hours | |
Secondary | Respiratory Rate (breaths/min) | Respiratory rate will be measured with a belt placed around the stomach and reported in units of breaths-per-minute. | 3 hours | |
Secondary | Heart Rate Variability (frequency) | Heart rate variability will be measured using electrocardiogram and reported in units of Hertz. | 3 hours | |
Secondary | Heart Rate Variability (time) | Heart rate variability will be measured using electrocardiogram and reported in units of milliseconds. | 3 hours | |
Secondary | Borg Rating of Perceived Exertion | Participants will be asked to rate their perceived exertion using the Borg Rating of Perceived Exertion scale. Scores range from 6-20 with higher scores indicating greater exertion. | 3 hours | |
Secondary | Numerical Pain Scale Rating | Participants will be asked to rate pain on a scale from 0 to 10. Higher scores indicate greater pain. | 3 hours | |
Secondary | Blood Levels: Estrogens-E1 | Serum concentration of estrogen-E1 will be reported in units of ng/ml. | 75 minutes | |
Secondary | Blood Levels: Estrogen-E2 | Serum concentration of estrogen-E2 will be reported in units of ng/ml. | 75 minutes | |
Secondary | Blood Levels: Progesterone | Serum concentration of progesterone will be reported in units of ng/ml. | 75 minutes | |
Secondary | Blood Levels: Testosterone | Serum concentration of testosterone will be reported in units of ng/ml. | 75 minutes | |
Secondary | Blood Levels: Follicle-Stimulating Hormone (FSH) | Serum concentration of FSH will be reported in units of IU/L. | 75 minutes | |
Secondary | Upper extremity fatiguing contraction with post exercise circulatory occlusion (PECO) | This test involves holding a hand grip device at 30% of the participant's maximum hand grip strength until they fatigue. At the end of this test a blood pressure cuff is inflated for two minutes. The outcome measurements are the total change in systolic, diastolic and mean blood pressure from rest as well as how much blood pressure changes every 15 seconds. The measurement units are the change in blood pressure in mmHg. | 3 hours | |
Secondary | Cold Pressor Test | The cold pressor test is done by placing the participant's hand in a bucket of ice-cold water for 2 minutes. The outcome measurements are the total change in systolic, diastolic and mean blood pressure from rest as well as how much blood pressure changes every 15 seconds. The measurement units are the change in blood pressure in mmHg. | 3 hours |
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