The Effects of Polyphenol-rich Berry Juice on Blood Pressure in Hypertensive Subjects

Overview

The purpose of this study is to investigate the effects of berry juices containing different levels of polyphenols on blood pressure and other cardiovascular risk factors. The study is a 12 week double blinded randomized controlled intervention trial. The subjects will be divided in three groups where one receives a placebo juice while the two other will consume 0.5 liter of juice containing different levels of polyphenols. Blood pressure will be monitored and blood samples will be taken.

Full Title of Study: “The Effects of Polyphenol-rich Berry Juice on Blood Pressure and Additional CVD Related Parameters in Pre-hypertensive Subjects”

Study Type

  • Study Type: Interventional
  • Study Design
    • Allocation: Randomized
    • Intervention Model: Factorial Assignment
    • Primary Purpose: Prevention
    • Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
  • Study Primary Completion Date: June 2012

Interventions

  • Dietary Supplement: Placebo
    • 500 ml/day Per 100g 6.25 g sucrose 6.25 g maltodextrin 1.3 g citric acid E330 (pH 3.0) 2.5 g Carmine solution E120 (4% carmine colouring agent) 0.025 g blueberry aroma Potassium sorbate E202 water
  • Dietary Supplement: Mana-juice
    • 500 ml/day of a grape,cherry, bilberry,aronia juice 13g carbohydrates/100g 150mg K/100g
  • Dietary Supplement: Optijuice
    • 500 ml/day of a Grape,cherry, bilberry,aronia, black current juice 13g carbohydrates/100g 150mg K/100g

Arms, Groups and Cohorts

  • Placebo Comparator: Control
    • 12 weeks intake of 0.5 liter/day placebo juice containing sugar, aromas and salt corresponding to the berry juices in the other groups. Blood pressure will be taken at time point 0,6 and 12 weeks. Blood and urine samples will be collected and weight and bioelectric impedance will be monitored at time point 0 and 12 weeks.
  • Active Comparator: Mana-juice
    • 12 weeks intake of 0.5 liter/day of a commercially available berry juice (Mana blue) rich in polyphenols (grape, cherries, bilberries and aronia). Blood pressure will be taken at time point 0,6 and 12 weeks. Blood and urine samples will be collected and weight and bioelectric impedance will be monitored at time point 0 and 12 weeks.
  • Active Comparator: Optijuice
    • 12 weeks intake of 0.5 liter/day of berry juice rich in polyphenols (grape, cherries, blueberry and aronia) and added extract from press cake of black currant. Blood pressure will be taken at time point 0,6 and 12 weeks. Blood and urine samples will be collected and weight and bioelectric impedance will be monitored at time point 0 and 12 weeks.

Clinical Trial Outcome Measures

Primary Measures

  • Systolic and diastolic blood pressure
    • Time Frame: Screening, baseline, 6 and 12 weeks
    • Change in blood pressure from baseline to 6 weeks and 12 weeks
  • Platelet aggregation
    • Time Frame: Baseline and 12 weeks
    • Change in platelet aggregation from intervention start till end analyzed by PFA100.
  • Cardiovascular disease risk factors
    • Time Frame: Baseline and 12 weeks
    • The effect of polyphenole-rich diet on cardiovascular disease risk factors in blood samples will be analyzed.
  • Diabetes related parameters in blood and urine
    • Time Frame: Baseline and 12 weeks
    • The effect of different doses and types of polyphenoles on diabetes related biomarkers in blood and urine will be analyzed.
  • Blood cell expression of stress-response and CVD related genes
    • Time Frame: Baseline and 12 weeks
    • Effect of polyphenole-rich diet on blood cell expression of stress-response and cardiovascular disease related genes by low density array and/or whole genome expression (microarray).

Secondary Measures

  • Polymorphisms in cardiovascular disease related genes
    • Time Frame: Baseline
    • Single nucleotide polymorphisms will be analyzed and eventually grouped and compared with the mentioned outcome measures to reveal individual mechanisms of the hypothetized effects of the intervention.
  • Whole genome transcription profiles and methylation patterns
    • Time Frame: Baseline and 12 weeks
    • Effects of polyphenoles on transcription profiles and methylation pattern will be analyzed.

Participating in This Clinical Trial

Inclusion Criteria

  • Pre-hypertension or hypertension systolic blood pressure in the 130-179 mmHg range and/or diastolic blood pressure in the 85-109 mmHg range) – BMI 20-35 kg/m2 – Stable weight (change <4 kg previous 12 weeks) Exclusion Criteria:

  • Regular use of blood pressure lowering agens – Diabetes type I or II – Smokers – Allergy to grape, cherries, blueberries/bilberries, black currant, aronia – Supplements for weight loss – Changes in pharmacological treatment of hyperlipidemia or hyperglycemia (initiation, termination or changes in dosage) last 30 days prior to inclusion or during the study period (run-in and intervention) – Participation in a drug trial during the previous 30 days

Gender Eligibility: All

Minimum Age: 50 Years

Maximum Age: 70 Years

Are Healthy Volunteers Accepted: Accepts Healthy Volunteers

Investigator Details

  • Lead Sponsor
    • University of Oslo
  • Collaborator
    • Fellesjuice AS
  • Provider of Information About this Clinical Study
    • Principal Investigator: Rune Blomhoff, Professor – University of Oslo
  • Overall Official(s)
    • Rune Blomhoff, PhD, Principal Investigator, University of Oslo

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