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Docosahexenoic Acid (DHA) Supplementation and Cardiovascular Disease in Men With High Triglycerides

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
ClinicalTrials.gov Identifier: NCT00728338
Recruitment Status : Completed
First Posted : August 5, 2008
Last Update Posted : August 8, 2008
VA Northern California Health Care System
DSM Nutritional Products, Inc.
Information provided by:
USDA, Western Human Nutrition Research Center

Brief Summary:
The purpose of this study is to determine the effects of supplementing diets of hyperlipidemic men with DHA (docosahexenoic acid) on risk factors for cardiovascular disease. We hypothesize that supplementing diets of hyperlipidemic men with DHA will decrease the plasma concentrations of CRP (C-reactive protein), inflammatory cytokines, and soluble adhesion molecules. We further hypothesize that DHA supplementation will decrease serum triglyceride concentrations and increase HDL concentration.

Condition or disease Intervention/treatment
Hypertriglyceridemia Dietary Supplement: Docosahexenoic acid (DHA) Dietary Supplement: Olive oil

Detailed Description:

Cardiovascular disease (CVD) and stroke are the leading causes of mortality in the United States, accounting for more than 38% of all deaths. Elevated total- and LDL- cholesterol, number of total and small dense LDL particles, triacylglycerols, and low HDL-C are established independent risk factors for the development of CVD. Additional novel blood lipid markers used as risk factors for CVD include, increased plasma concentration of remnant like particle-cholesterol (RLP-C), decreased ratio between plasma eicosapentaenoic acid (EPA) and arachidonic acd (AA), and decreased omega-3 index (sum of EPA and DHA as a percentage of total fatty acid content) of the red blood cells.

Diets rich in omega-3 fatty acids have been shown to be cardio-protective; these diets decreased inflammation, platelet aggregation, cardiac arrhythmias, triglycerides, number of total LDL and small dense LDL particles, and increased omega-3 index, endothelial relaxation and atherosclerotic plaque stability. Most of the earlier studies regarding the effects of long chain n-3 PUFA on blood lipids were conducted with fish oils which contain a mixture of EPA and DHA. Recently a number of studies have been conducted with EPA and DHA individually. Results from studies with individual fatty acids show that EPA and DHA have similar effects on some of the lipid parameters, but they are assimilated to a different concentration in tissues and have different effects on lipoprotein particle size, heart rate and blood pressure. The main purpose of this study is to examine the effects of DHA supplementation on the above three risk factors.

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 40 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Triple (Participant, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Effect of Docosahexenoic Acid (22:6n-3, DHA) Supplementation on Risk Factors for Cardiovascular Disease in Hyperlipidemic Men
Study Start Date : June 2003
Primary Completion Date : November 2005
Study Completion Date : November 2005

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Triglycerides
Drug Information available for: Olive oil
U.S. FDA Resources

Arm Intervention/treatment
Experimental: 1
Martek Biosciences Corporation Neuromins Capsules 7.5 g DHA oil/day
Dietary Supplement: Docosahexenoic acid (DHA)
The DHA group received 7.5 g/d DHA oil (DHA 3.0 g/d) which is produced in the microalga Crypthecodinium cohinii.
Other Name: Martek Biosciences Corporation, Neuromins Capsules
Placebo Comparator: 2
7.5 g/ day olive oil
Dietary Supplement: Olive oil
7.5 g olive oil/day

Primary Outcome Measures :
  1. Plasma biomarkers of inflammation [ Time Frame: 0, 45, and 90 days ]

Secondary Outcome Measures :
  1. Granulocyte maturation [ Time Frame: 0, 45, and 90 dyas ]
  2. fasting and post-prandial serum lipids and lipoproteins [ Time Frame: 0, 45, and 90 days ]
  3. blood pressure and blood clotting [ Time Frame: 0, 45, and 90 days ]
  4. plasma biomarkers for diabetes [ Time Frame: 0, 45, and 90 days ]

Information from the National Library of Medicine

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Ages Eligible for Study:   39 Years to 66 Years   (Adult, Senior)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • fasting serum triglyceride values of 150-400 mg/dL
  • total cholesterol < 300 mg/dL
  • LDL-cholesterol < 220 mg/dL
  • BMI between 22 and 35 Kg/m2

Exclusion Criteria:

  • anti-inflammatory medications including steroids
  • antihypertensives
  • non sulfonyl urea medications for diabetes mellitus
  • drugs that alter serum triacylglycerols and HDL-C levels (i.e. fibrates)
  • niacin supplements
  • consumers of illegal substances
  • consumers of more than 5 drinks of alcohol per week
  • more than one fish meal per week
  • dietary supplements of fish oil, flaxseed oil or vitamin C or E

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00728338

United States, California
Usda, Ars, Whnrc
Davis, California, United States, 95616
Sponsors and Collaborators
USDA, Western Human Nutrition Research Center
VA Northern California Health Care System
DSM Nutritional Products, Inc.
Principal Investigator: Darshan S Kelley, PhD USDA, ARS, WHNRC

Additional Information:
Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Responsible Party: Darshan S. Kelley, Ph.D., USDA, ARS, WHNRC
ClinicalTrials.gov Identifier: NCT00728338     History of Changes
Other Study ID Numbers: WHNRC002
First Posted: August 5, 2008    Key Record Dates
Last Update Posted: August 8, 2008
Last Verified: August 2008

Keywords provided by USDA, Western Human Nutrition Research Center:
docosahexenoic acid (DHA)
dietary supplement
n-3 polyunsaturated fatty acid
cardiovascular disease

Additional relevant MeSH terms:
Cardiovascular Diseases
Lipid Metabolism Disorders
Metabolic Diseases