- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT01566084
Efficacy of Dietary Sodium Restriction of Improving Vascular Endothelial Function in Middle Aged and Older Adults
December 4, 2015 updated by: Douglas Seals, University of Colorado, Boulder
The investigators hypothesize that reducing salt in the diet will improve the function of blood vessels in middle aged and older adults with moderately elevated systolic blood pressure, by increasing the amount of BH4 and nitric oxide in your blood vessels and reducing the amount of oxidative stress.
Study Overview
Status
Completed
Conditions
Intervention / Treatment
Detailed Description
The improvement in blood vessel function will be determined over a 10 week period.
Subjects will be randomly assigned to either a 'low salt' condition (placebo pills + 1200 mg dietary sodium) or a 'normal salt' condition (2300 mg sodium chloride pills + 1200 mg dietary sodium) and monitored for 5 weeks.
After the initial set of 5 weeks, the subjects are switched into the opposite condition, completing the cross-over study design.
During weeks 1-4 and 6-9, subjects are monitored weekly with 24 hour urine collections and diet logs.
The assessment of the primary outcome (blood vessel function) is completed during weeks 5 and 10.
BH4 and ascorbic acid are also administered during weeks 5 and 10 to measure the effects of sodium intake on endogenous BH4 levels and vascular oxidative stress.
Study Type
Interventional
Enrollment (Actual)
17
Phase
- 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
-
-
Colorado
-
Boulder, Colorado, United States, 80309
- Clinical Translational Research Center
-
-
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
Ages Eligible for Study
50 years to 79 years (Adult, Older Adult)
Accepts Healthy Volunteers
Yes
Genders Eligible for Study
All
Description
Inclusion Criteria:
- 50-79 years of age
- SBP 130-159 mmHg
Exclusion Criteria:
- Have been sick with an infection in the past two weeks
- Are currently sick or have ongoing health problems such as kidney or CVD
- Have lost more than 11 lbs. in the last 3 months
- Are taking any type of antioxidants
- Smoke or have alcohol problems
- Have blood glucose levels higher than 126 mg/dL
- Have resting SBP below or less than 100 mmHg or greater than 159 mmHg
- Have a resting diastolic blood pressure greater than 99 mmHg
- Have a BMI greater than 40 kg/m^2
- Are presently consuming less than 9 or greater than 18 grams of salt / day
- Have a baseline FMD of greater than 6%
- Are taking any of the following types of drugs: blood thinners, anti-seizure medications, ant-inflammatory drugs
- Participate in any high endurance athletic training
- Taking Hormone Replacement Therapy
- Have not been post-menopausal for at least 1 year
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: Treatment
- Allocation: Randomized
- Interventional Model: Crossover Assignment
- Masking: Triple
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Other: Normal sodium
Subjects on a 1200 mg sodium diet are given 2300 mg sodium in the form of slow sodium tablets to bring them back up to a normal salt intake.
Subjects then cross-over to the low sodium condition in the second half of the study.
|
The normal salt condition is maintained with 2300 mg / day in the form of slowly released salt (NaCl) tablets.
|
Other: Low sodium
Subjects on a 1200 mg salt diet are given placebo pills in order to maintain them on a low salt diet.
Subjects then cross-over to the normal sodium condition in the second half of the study.
|
Placebo tablets are administered to maintain the low sodium condition.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Improved Flow Mediated Dilation
Time Frame: Week 5 (after first condition of low salt or normal salt), Week 10 (after second condition, opposite to first)
|
FMD is analyzed at weeks 5 and 10 or after each condition in this cross-over study design.
Subjects are randomly assigned to a low salt or normal salt condition for the first set of 5 weeks and then crossed over to the other condition for the second set of 5 weeks.
|
Week 5 (after first condition of low salt or normal salt), Week 10 (after second condition, opposite to first)
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Vascular Oxidative Stress
Time Frame: Immediately following acute infusion of ascorbic acid on Weeks 5 and 10
|
Change in FMD following acute infusion of ascorbic acid (a dose known to scavenge superoxide) is measured at the end of 5 weeks of sodium condition (low and normal intake) as an index of vascular oxidative.
|
Immediately following acute infusion of ascorbic acid on Weeks 5 and 10
|
BH4 Bioavailability
Time Frame: Immediately following acute administration of BH4 on Weeks 5 and 10
|
Change in FMD following acute oral tetrahydrobiopterin (BH4) is measured at the end of 5 weeks of sodium condition (low and normal intake) as an index of BH4 bioavailability.
|
Immediately following acute administration of BH4 on Weeks 5 and 10
|
Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Sponsor
Collaborators
Investigators
- Principal Investigator: Kristen L Jablonski, PhD, University of Colorado, Boulder
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.
Helpful Links
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
February 1, 2009
Primary Completion (Actual)
January 1, 2012
Study Completion (Actual)
January 1, 2012
Study Registration Dates
First Submitted
March 23, 2012
First Submitted That Met QC Criteria
March 28, 2012
First Posted (Estimate)
March 29, 2012
Study Record Updates
Last Update Posted (Estimate)
January 7, 2016
Last Update Submitted That Met QC Criteria
December 4, 2015
Last Verified
December 1, 2015
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- B5114
- F31AG033994 (U.S. NIH Grant/Contract)
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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