Cardiovascular Diseases, Diabetes, Metabolic Syndrome
Conditions
Keywords
Metabolic Syndrome, Arterial Stiffness, Blood Pressure, Endothelial Function, Tart Cherries
Brief summary
The hypothesis of this study is that the daily consumption of 480 ml tart cherry juice for twelve weeks will improve blood pressure and arterial stiffness by improving endothelial-mediated vasodilation and vascular sympathetic activity and favorably altering biochemical markers associated with cardiovascular risk. 28 men and women between the ages of 20 and 40 who have three of the five features of metabolic syndrome as defined by the Adult Treatment Panel III will be included in the study. After a two-week run-in phase, eligible men and women will be randomly assigned to one of two treatment groups: 1) 480 ml tart cherry juice or 2) 480 ml control drink daily for twelve weeks. After an initial telephone screening, all participants will be requested to report to the study site for their first visit. On the first visit (screening), participants will be provided with verbal and written explanation of the project. They will then be asked to sign an informed consent form, followed by measuring waist circumference, resting brachial blood pressure, fasting serum triglycerides, high density lipoprotein cholesterol, and glucose levels to confirm metabolic syndrome. Baseline assessments will be performed for medical history, medication use, dietary intake, and physical activity. Qualified participants will be scheduled for their second visit two weeks later (actual baseline data collection) and randomly assigned to their treatment group. On the second (baseline) visit between the hours of 7-10 A.M., blood pressure and vascular function will be measured followed by blood draw. Anthropometrics will be measured. Participants will be provided with their assigned treatment and will receive standard instructions on how to fill out daily diaries for their treatment, and for food and physical activity records. Blood pressure, vascular function, blood draw, and anthropometric, body composition, diet, and physical activity assessments will be repeated at 6- (third visit), and 12-week (final visit) intervals. All cardiovascular measurements will be performed between 7:00 to 10:00 A.M., in a quiet temperature-controlled room in the supine position after an overnight fast and 12 hours after the abstinence of caffeine and/or 24 hours after the last bout of moderate to heavy physical activity.
Interventions
DIETARY_SUPPLEMENTTart Cherry
12 weeks of tart cherry juice taken in two doses of 240 ml per day.
DIETARY_SUPPLEMENTPlacebo
12 weeks of tart cherry juice taken in two doses of 240 ml per day.
Sponsors
Cherry Research Committee
Florida State University
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
SINGLE (Subject)
Eligibility
Sex/Gender
ALL
Age
20 Years to 60 Years
Healthy volunteers
No
Inclusion criteria
* Three of the following five features at the screening visit: * Waist circumference of ≥ 40 inches for men and 35 inches for women * Serum triglycerides ≥ 150 mg/dL * Serum high density lipoprotein cholesterol levels \< 40 mg/dL for men and \<50 mg/dL for women * Blood pressure ≥ 130/85 mm Hg * Fasting blood glucose level ≥ 110 mg/dL
Exclusion criteria
* Taking hypoglycemic, antihypertensive or cholesterol-lowering medications * Diagnosed cardiovascular disease * Uncontrolled hypertension (≥ 160/100 mmHg) * Diabetes mellitus * Other active chronic diseases such as cancer, asthma, glaucoma, thyroid, kidney, liver and pancreatic disease * Participating in a weight loss program * Heavy smokers (\> 20 cigarettes per day) * Heavy drinkers (\> 12 alcoholic drinks per week) * Abnormal menstrual cycle
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Blood Pressure | 12 weeks | By measuring brachial and aortic blood pressure at rest and during physiological stress (handgrip exercise and post-exercise muscle ischemia). |
| Arterial Stiffness | 12 weeks | By measuring arterial stiffness and augmentation index at rest and during physiological stress (handgrip exercise and post-exercise muscle ischemia). |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Autonomic Control of Blood Pressure | 12 weeks | By measuring blood pressure variability and baroreflex sensitivity at rest and during physiological stress. |
| Endothelial Function | 12 weeks | By measuring markers of endothelial function. |
| Endothelial-mediated Vasodilation | 12 weeks | By measuring flow-mediated dilation in the brachial artery. |
| Atherogenic Markers | 12 weeks | By measuring adhesion factors, lipid profiles, and atherogenic risk ratios. |
| Oxidative Stress | 12 weeks | By measuring markers of oxidative stress. |
| Insulin Sensitivity | 12 weeks | By measuring fasting glucose, insulin, and homeostatic model assessments of insulin resistance, sensitivity, and beta cell function. |
| Inflammation | 12 weeks | By measuring a marker of inflammation. |
| Body Composition | 12 weeks | By measuring fat mass and fat-free mass using dual-energy X-ray absorptiometry and anthropometrics. |
Countries
United States
Outcome results
None listed