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Evaluating the Relationship Between Stress, Ethnicity, and Blood Pressure

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: NCT00783497
Recruitment Status : Completed
First Posted : October 31, 2008
Last Update Posted : December 17, 2015
Information provided by (Responsible Party):

Study Description
Brief Summary:
High blood pressure is a common health problem among people in the United States. This study will examine the ways that stress and ethnicity play a role in the development of high blood pressure.

Condition or disease

Detailed Description:

High blood pressure affects nearly one third of all people in the United States. It can be caused by many factors, including obesity, sodium intake, genetics, and stress. Ethnicity appears to also play a role, because African Americans are more susceptible to developing high blood pressure than other ethnic groups, with more than 40% of African Americans diagnosed with this condition. This study will examine the underlying reasons of why stress and African-American ethnicity contribute to high blood pressure risk and how ethnicity and stress interact with each other to increase this risk. Specifically, study researchers will examine how stress increases blood pressure, how people from different ethnic groups respond to stress differently, and how sleep plays a role in regulating blood pressure levels.

This study will enroll African Americans and Caucasians who have high blood pressure, as well as African Americans and Caucasians who have normal blood pressure. Potential participants will go through a screening process that involves a medical history review, questionnaires, and blood pressure monitoring. Eligible participants will then be admitted to the research clinic for a 2-night stay. Participants' nutrition history and body measurements will be obtained, and a catheter will be inserted into the arm so that blood can be easily collected during the clinic stay. During the night, participants' breathing habits and movements will be monitored while they sleep. During the day, blood pressure and heart activity will be monitored frequently, including when participants are asked to perform mildly stressful tasks, such as giving a short speech. Various medications that affect heart rate and blood pressure will be given at different times during the study, and researchers will monitor participants' reactions to each medication. Lastly, participants will also complete psychological questionnaires.

Study Design

Study Type : Observational
Actual Enrollment : 203 participants
Observational Model: Case Control
Time Perspective: Cross-Sectional
Official Title: Stress, Blood Pressure, & Ethnicity
Study Start Date : October 2005
Primary Completion Date : September 2010
Study Completion Date : December 2010
Groups and Cohorts

Caucasian Americans
African Americans

Outcome Measures

Biospecimen Retention:   Samples With DNA
Serum, urine

Eligibility Criteria

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 50 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population
Community sample in the San Diego, California metropolitan area

Inclusion Criteria:

  • Self-identifies as African American or Caucasian
  • Weighs 85% to 150% of ideal weight (approximate BMI of 17.5 to 30)
  • In good physical health

Exclusion Criteria:

  • Blood pressure greater than 180/110 mm Hg at any point in the past
  • Currently works less than half-time
  • Currently is employed doing shift work
  • Currently takes prescription medication, other than anti-hypertensive medication
  • Currently smokes
Contacts and Locations

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): NCT00783497

United States, California
University of California, San Diego
San Diego, California, United States, 92103
Sponsors and Collaborators
University of California, San Diego
National Heart, Lung, and Blood Institute (NHLBI)
Principal Investigator: Joel E. Dimsdale, MD University of California, San Diego
More Information

Responsible Party: Joel E. Dimsdale, M.D., Emeritus Professor, University of California, San Diego
ClinicalTrials.gov Identifier: NCT00783497     History of Changes
Other Study ID Numbers: 599
R01HL036005 ( U.S. NIH Grant/Contract )
5R01HL036005-23 ( U.S. NIH Grant/Contract )
First Posted: October 31, 2008    Key Record Dates
Last Update Posted: December 17, 2015
Last Verified: December 2015

Keywords provided by Joel E. Dimsdale, M.D., University of California, San Diego:
High Blood Pressure