Effect of Long Term Cocoa Flavanol Intake on Blood Pressure and Platelet Function in Healthy Adults, Part 1

May 26, 2017 updated by: University of California, Davis
Flavanols are plant-derived compounds commonly present in the human diet. Examples of flavanol-containing foods and beverages are apples, chocolate, tea, wine, berries, pomegranate and nuts. The consumption of flavanol-containing foods and beverages has been associated with improvements in cardiovascular health. In this study, the investigators hope to learn more about the effects of the consumption of increasing amounts of cocoa flavanols on blood pressure, platelet function and other metabolic parameters in healthy humans. This study was followed by a second study that aimed at investigating the effects of long term consumptions of cocoa flavanols on blood pressure, platelet function and other metabolic parameters in healthy humans.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
37

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • California
      • Davis, California, United States, 95616
        • Ragle Human Nutrition Research Center, Department of Nutrition at UC Davis

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

30 years to 55 years (Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • 30-55 years old
  • A normal blood chemistry and liver function
  • BMI < 30 kg/m2
  • previously consumed cocoa and peanut products, with no adverse reactions

Exclusion Criteria:

  • A history of cardiovascular disease, stroke, hypertension, renal, hepatic, or thyroid disease, GI tract disorders, previous GI surgery, metabolic syndrome, diabetes, taking cholesterol-lowering medication, hormone replacement therapy, antioxidant supplements, on aspirin therapy or taking anticoagulants, or on a medically prescribed diet.
  • Allergies to nuts, cocoa and chocolate products
  • Vegetarian, Vegan, food faddists, individuals using non-traditional diets, on a weight loss diet or using herbal dietary supplements

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Basic Science
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Cocoa Flavanol intake escalation
Ingestion of increasing number of capsules containing Mars Cocoa Extract manufactured by the Cocoapro® process (500 mg of cocoa flavanols/capsule) during 6 weeks followed by a 2 week of washout (no capsule intake)
Dietary supplement: Mars Cocoa Extract Capsules
Capsules containing Mars Cocoa Extract manufactured by the Cocoapro® process, providing 500 mg of cocoa flavanols per capsule: 1000 mg of cocoa flavanols consumed daily during week 1 and 2, 1500 mg of cocoa flavanols consumed daily during week 3 and 4, and 2000 mg of cocoa flavanols consumed daily during week 5 and 6, and no capsule consumed (washout) during week 7 and 8.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Change in blood pressure
Time Frame: Baseline (day 0) and 14, 28, 42 and 56 days after intervention
Blood pressure will be measured using standard techniques.
Baseline (day 0) and 14, 28, 42 and 56 days after intervention
Change in platelet function
Time Frame: Baseline and 14, 28, 42 and 56 days after intervention
Platelet function will be determined using the PFA-100® analyzer (Dade Behring International, Miami, FL) with collagen-epinephrine (CEPI)- and collagen-ADP (CADP) stimulation.
Baseline and 14, 28, 42 and 56 days after intervention
Change in metabolic parameters in blood
Time Frame: Baseline (day 0) and 14, 28, 42 and 56 days after intervention
Metabolic parameters determined in blood included: comprehensive metabolic panel, liver panel and cell blood counting.
Baseline (day 0) and 14, 28, 42 and 56 days after intervention

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Change in plasma concentration of cocoa flavanol metabolites
Time Frame: Baseline (day 0) and 14, 28, 42 and 56 days after intervention
Cocoa flavanol metabolites in plasma include: structurally related (-)-epicatechin metabolites and 5-(3,4-dihydroxyphenyl)-4-valerolactone metabolites
Baseline (day 0) and 14, 28, 42 and 56 days after intervention
Change in plasma concentration of methylxanthines
Time Frame: Baseline (day 0) and 14, 28, 42 and 56 days after intervention
Methylxanthines determined in plasma include: caffeine, theobromine, paraxanthine and theophylline
Baseline (day 0) and 14, 28, 42 and 56 days after intervention

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
University of California, Davis

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
May 1, 2012

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
July 1, 2012

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
July 1, 2012

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
May 15, 2015

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 18, 2015

First Posted (Estimate)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
May 19, 2015

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
May 30, 2017

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 26, 2017

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
May 1, 2017

More Information

Terms related to this study

Keywords

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 311497
  • 311497-I (Other Identifier: UC Davis)

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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