Effects of Fish-oil on Mood and Cognitive Functions of Healthy Individuals

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. Identifier: NCT01104194
Recruitment Status : Completed
First Posted : April 15, 2010
Last Update Posted : July 11, 2011
Information provided by:
Leiden University Medical Center

Brief Summary:

The investigators recently found a positive effect of omega-3 supplements on cognitive function in healthy individuals after 4 weeks (J of Psychopharmacology 2009, 23: 831-840). The investigators hypothesize that 4 weeks consumption of omega-3 supplements in previously depressed individuals will positively affect their cognitive functions.

Secondly, low Heart Rate Variability (HRV) is a risk factor for cardiovascular disease. Some studies have found low HRV in patients with depression. No studies have investigated the effects of omega-3 fatty acid supplements on Heart Rate Variability in individuals with a history of depression. The investigators will test the hypotheses that omega-3 supplements lead to an improvement of heart rate variability indices in healthy volunteers with a history of depression.

Condition or disease Intervention/treatment Phase
Depression Dietary Supplement: omega-3 fatty acids supplements (fish oil) Dietary Supplement: Placebo Not Applicable

Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 60 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Triple (Participant, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: The Effects of Omega-3 Fatty Acids Dietary Supplements (Fish-oil) on Mood and Cognitive Functions of Healthy Individuals
Study Start Date : September 2008
Actual Primary Completion Date : September 2010
Actual Study Completion Date : September 2010

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Experimental: Fish-oil Dietary Supplement: omega-3 fatty acids supplements (fish oil)
1.74g eicosapentaenoic acid (EPA) and 0.25g docosahexaenoic acid (DHA)

Placebo Comparator: Placebo
Olive oil capsules, identical in appearance to fish oil capsules
Dietary Supplement: Placebo
softgel capsules (identical in appearance to fish oil capsules) containing olive oil. 3 capsules/day, 4 weeks

Primary Outcome Measures :
  1. Cognition [ Time Frame: 4 weeks ]
    Battery of test measuring emotional and neutral information processing. Largest effect expected on Decision Making Test (cf. Antypa et al., 2009) and Emotion Recognition Test.

  2. Heart Rate Variability [ Time Frame: 4 weeks ]

Secondary Outcome Measures :
  1. Mood states [ Time Frame: 4 weeks ]

    Fatigue, Anger, Tension, Anxiety, Vigor (Profile of Mood States, self-report measure).

    Depressive symptoms.

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 45 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Dutch-speaking men and women
  • Normal weight (BMI between 18 and 27).
  • Regular diets, not containing fish more than once a week.
  • History of depression (at least one major depressive episode in the past).

Exclusion Criteria:

  • Currently more than mildly depressed (BDI-II-NL score higher than 19, or score on the suicidality item of this scale higher than 1).
  • Current or past psychosis
  • Current substance abuse or past substance dependence
  • Smoking or current use of soft drugs (current = month prior to study till completion)
  • Any hard drug use (lifetime)
  • More than 3 alcoholic consumptions/day

Participants will be asked to keep their dietary habits constant throughout the study.

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 identifier (NCT number): NCT01104194

Leiden University
Leiden, ZH, Netherlands, 2333 AK
Sponsors and Collaborators
Leiden University Medical Center

Responsible Party: Prof AJW Van der Does, Leiden University Identifier: NCT01104194     History of Changes
Other Study ID Numbers: P07.063
First Posted: April 15, 2010    Key Record Dates
Last Update Posted: July 11, 2011
Last Verified: July 2011

Keywords provided by Leiden University Medical Center:
heart rate variability
omega-3 fatty acids
Depression (in remission) (vulnerability to depression)

Additional relevant MeSH terms:
Behavioral Symptoms