Blood PressureNCT01017484
Mechanism of the Blood Pressure Lowering Effect of the DASH Dietary Pattern
A study of Blood Pressure, run by Duke University.
Trial summary
Understanding the possible mechanism(s) by which the DASH dietary pattern lowers blood pressure will potentially enhance the value of this dietary intervention by elucidating the conditions under which it will be most effective, identifying target populations, examining its impact on vascular health beyond blood… Read more about this study
- Who is it for?
- Ages 22 years and olderHealthy volunteers can take part
- Conditions the study is for
- Blood Pressure
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 20 participants
- Where
- No sites listed yet
- Study dates
- Jul 2007to Jun 2009
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 22 years and older
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Who may be able to join
- SBP 140-159 mm Hg and DBP 90-99 mm Hg based on mean values over two screening visits,
- Age ≥22 years, and
- Willing to eat at least one on-site meal/day, five days/week, and willing to eat study diets and nothing else for the 3 weeks of controlled feeding.
Who cannot join
- Any serious illness that would interfere with participation or make DASH diet unsafe to the participants,
- Currently on cancer chemotherapy or with evidence of active malignancy or radiation therapy within past six months,
- History of CVD event (MI, CABG, angioplasty, symptomatic ischemic heart disease, or stroke),
- Clinical diagnosis of congestive heart failure,
- Current diagnosis of diabetes and treatment for diabetes with oral medication or insulin,
- Body mass index > 45 Kg/m2,
Show all 15Show fewer
- DASH MECHANISM staff or household member of DASH MECHANISM staff,
- Using Medications including BP lowering drugs within the last three months, using lithium,insulin or oral diabetes medications, oral corticosteroids, unstable doses of psychotropics or phenothiazines, antacids or nutritional supplements unless they can be discontinued, or weight reducing medications;
- Consumption of more than 14 alcoholic drinks per week;
- Investigator discretion for safety or compliance reasons;
- Inability to provide reliable BP \& vascular functions measurements;
- Planning to leave the area prior to the anticipated end of the intervention period;
- Pregnant, planning a pregnancy prior to the end of intervention, or breast feeding;
- Significant food allergies, preferences, or dietary requirements that would interfere with diet adherence; and
- Subjects taking medications for erectile dysfunction.
About this study
Understanding the possible mechanism(s) by which the DASH dietary pattern lowers blood pressure will potentially enhance the value of this dietary intervention by elucidating the conditions under which it will be most effective, identifying target populations, examining its impact on vascular health beyond blood pressure, and enhancing the investigators' understanding of the interactions among diet, blood pressure and vascular function. In addition, results of this study may help to identify additional therapeutic targets. Therefore, the overall goal of the proposed study is to determine the mechanism(s) by which the DASH dietary pattern lowers blood pressure by using a controlled feeding design.
Read the detailed description
Randomized, controlled feeding trials have established the BP lowering effects of the Dietary Approaches to Stop Hypertension (DASH) dietary pattern, which emphasizes fruits, vegetables and low fat dairy and is low in saturated and total fat. The DASH studies were designed to establish efficacy, not to determine mechanism of action. Other studies suggest that the DASH diet may have effects on the renin-angiotensin-aldosterone system (RAAS). These effects have not been directly evaluated, nor have other potential mechanisms of action such as effects on adrenergic tone, vascular function and inflammation. The BP-lowering effect of the DASH dietary pattern was maximal after two weeks of controlled feeding, and was comparable in magnitude to antihypertensive medication among participants with stage 1 hypertension. Understanding the possible mechanism(s) by which the DASH diet lowers BP will potentially enhance the value of this intervention by elucidating the conditions under which it will be most effective, identifying target populations, examining its impact on vascular health beyond BP, and enhancing our understanding of the interactions among diet, BP and vascular function. In addition, results of this study may help to identify additional therapeutic targets. Therefore, the overall goal of the proposed study is to determine the mechanism(s) by which the DASH diet lowers BP. Our unifying hypothesis is that DASH diet lowers BP through effects on vascular function and sodium excretion, mediated through the effects on RAAS.
- Conditions
- Blood Pressure
- Being tested
- DASH, Control
- Keywords
- blood pressure, DASH diet, hypertension
- Medical subject headings
- Hypertension
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
DASH, ControlOther
controlled feeding of either the DASH dietary pattern or a typical American diet at isocaloric level.
| Study group | Role | What they receive |
|---|---|---|
| DASH | Experimental | The Dietary Approaches to Stop Hypertension Dietary pattern. Receives: Other: DASH, Control |
| Control | Experimental | The typical American diet as estimated from the NHANES survey. Receives: Other: DASH, Control |
What is being measured
The primary outcome is the main question the study is designed to answer.
urinary sodium
Measured: 2 weeks
Secondary outcomes (1)
blood pressure
Measured: 2 weeks
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted20 Nov 2009 (estimated)
- Study startJul 2007
- Primary completionJun 2009
- Study completionJun 2009
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Blood PressureStudies of the same condition, open and under way.
- More trials run by Duke UniversityThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Double blind
- Who is masked
- Participant, Outcomes assessor
- Enrolment
- 20 participants (actual)
Sponsor and investigators
- Lead sponsor
- Duke University
- Sponsor type
- University, hospital or other
- Collaborators
- American Heart Association
- Responsible party
- Sponsor
- Investigators
- Pao-Hwa Lin, PhD, Principal investigator, Duke University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT01017484
- Sponsor's protocol ID
- Pro00001236
- Other IDs
- AHA 0755460U
- Status last verified
- Nov 2009
- First submitted
- 19 Nov 2009
- Last updated
- 11 Apr 2013
- Results posted
- No
- Data monitoring committee
- No
Study at a glance
From the registry record, last updated by the sponsor on 11 Apr 2013. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Mechanism of the Blood Pressure Lowering Effect of the DASH Dietary Pattern
- ClinicalTrials.gov ID
- NCT01017484
- Acronym / sponsor ID
- Pro00001236
- Conditions
- Blood Pressure
- Keywords
- blood pressure, DASH diet, hypertension
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 20 participants (actual)
- Lead sponsor
- Duke UniversityUniversity, hospital or other
- Collaborators
- American Heart Association
- Study start
- Jul 2007
- Primary completion
- Jun 2009 (actual)
- Study completion
- Jun 2009 (actual)
- First posted
- 20 Nov 2009 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Understanding the possible mechanism(s) by which the DASH dietary pattern lowers blood pressure will potentially enhance the value of this dietary intervention by elucidating the conditions under which it will be most effective, identifying target populations, examining its impact on vascular health beyond blood pressure, and enhancing the investigators' understanding of the interactions among diet, blood pressure and vascular function. In addition, results of this study may help to identify additional therapeutic targets. Therefore, the overall goal of the proposed study is to determine the mechanism(s) by which the DASH dietary pattern lowers blood pressure by using a controlled feeding design.
Detailed description
Randomized, controlled feeding trials have established the BP lowering effects of the Dietary Approaches to Stop Hypertension (DASH) dietary pattern, which emphasizes fruits, vegetables and low fat dairy and is low in saturated and total fat. The DASH studies were designed to establish efficacy, not to determine mechanism of action. Other studies suggest that the DASH diet may have effects on the renin-angiotensin-aldosterone system (RAAS). These effects have not been directly evaluated, nor have other potential mechanisms of action such as effects on adrenergic tone, vascular function and inflammation. The BP-lowering effect of the DASH dietary pattern was maximal after two weeks of controlled feeding, and was comparable in magnitude to antihypertensive medication among participants with stage 1 hypertension. Understanding the possible mechanism(s) by which the DASH diet lowers BP will potentially enhance the value of this intervention by elucidating the conditions under which it will be most effective, identifying target populations, examining its impact on vascular health beyond BP, and enhancing our understanding of the interactions among diet, BP and vascular function. In addition, results of this study may help to identify additional therapeutic targets. Therefore, the overall goal of the proposed study is to determine the mechanism(s) by which the DASH diet lowers BP. Our unifying hypothesis is that DASH diet lowers BP through effects on vascular function and sodium excretion, mediated through the effects on RAAS.
Study design
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Double blind (participant, outcomes assessor)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| DASH | Experimental | Other: DASH, ControlThe Dietary Approaches to Stop Hypertension Dietary pattern. |
| Control | Experimental | Other: DASH, ControlThe typical American diet as estimated from the NHANES survey. |
Who may qualify
- Ages
- 22 years and older
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (3 listed)
- SBP 140-159 mm Hg and DBP 90-99 mm Hg based on mean values over two screening visits,
- Age ≥22 years, and
- Willing to eat at least one on-site meal/day, five days/week, and willing to eat study diets and nothing else for the 3 weeks of controlled feeding.
Key exclusion criteria (15 listed)
- Any serious illness that would interfere with participation or make DASH diet unsafe to the participants,
- Currently on cancer chemotherapy or with evidence of active malignancy or radiation therapy within past six months,
- History of CVD event (MI, CABG, angioplasty, symptomatic ischemic heart disease, or stroke),
- Clinical diagnosis of congestive heart failure,
- Current diagnosis of diabetes and treatment for diabetes with oral medication or insulin,
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| DASH, Controlcontrolled feeding of either the DASH dietary pattern or a typical American diet at isocaloric level. | Other | Control, DASH |
Primary outcome
urinary sodium
Time frame: 2 weeks
1 secondary outcome
blood pressure
Time frame: 2 weeks
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 11 Apr 2013.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Pao-Hwa Lin, PhD principal investigator
Duke University
Questions about this trial
What is this clinical trial studying?
A study of Blood Pressure, run by Duke University.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 3 inclusion and 15 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 11 Apr 2013. Status can change between updates, so confirm with the study contact before making plans.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
urinary sodium (time frame: 2 weeks). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 11 Apr 2013.