Track topics on Twitter Track topics that are important to you
To compare the effects of three levels of dietary sodium and two patterns of diet (a control diet and an intervention diet high in fruits, vegetables, and low fat dairy products and low in fat) on blood pressure in individuals with higher than optimal blood pressure or with Stage 1 hypertension.. DASH - Sodium built on and extended the results of the NHLBI-initiated Dietary Approaches to Stop Hypertension (DASH) study.
High blood pressure, defined as systolic blood pressure greater than or equal to 140 mm Hg or diastolic blood pressure greater than or equal to 90 mm Hg, or taking antihypertensive medication, affects 24 percent of the United States adult population or about 50 million people. Because the risk of cardiovascular disease and stroke increases with increasing blood pressure throughout the entire range of blood pressure levels, people with blood pressure above the optimal level of 120/80 are at increased risk of disease. Approximately 48 percent of the adult population have blood pressure either normal but above optimal levels or have Stage 1 hypertension, a prevalence which increases with age. To combat this highly prevalent condition, primary prevention through lifestyle modification represents a highly promising strategy for public health.
DASH - Sodium extended research from DASH trial to address several issues of relevance to clinical practice and public health and capitalized on the success of DASH by following the multicenter outpatient feeding study model. The model permitted a true test of efficacy because of high adherence and follow-up rates. In addition, the population studied across four geographic areas, encompassing individuals with diastolic blood pressure between 80-95 mm Hg and systolic blood pressure <160 mm Hg, was broadly representative, thus making the results generalizable to a large portion of the United States population.
The effects on blood pressure of three levels of sodium intake and two dietary patterns were compared. The combined impact of sodium reduction with dietary intervention was evaluated as a potential non-pharmacologic treatment alternative to drug therapy for stage one hypertension or for maintaining normal blood pressure levels. The two dietary patterns were a control diet that represented the typical American diet and an intervention diet (DASH diet) that was high in fruits, vegetables, included whole grains, poultry, fish, and nuts, and reduced in fats, red meat, sweets, and sugar-containing beverages and dairy products. The three levels of sodium were higher (current United States intake), intermediate (current recommended levels), and lower (potentially optimal levels). Participants were assigned to one of the two dietary patterns using a parallel group design and were fed at each sodium level using a randomized cross-over design.
Three eligibility pre-screening visits were followed by a two-week run-in feeding period and then a four-week intervention period at each of three sodium levels. During the run-in for the intervention feeding periods, all food was provided to participants. They were required to attend the clinic for at least one meal per day, five days per week, and to take home food to eat for other meals. Each of the four clinics recruited 100 participants. Blood pressure was measured once a week during the first of three weeks and five times during the last week. During the final feeding period, fasting blood was collected and 24-hour urine collections were analyzed for magnesium, potassium. calcium, sodium, and creatinine.
DASH - Sodium determined, separately by race, gender, and hypertension status: 1) the effects on blood pressure of three levels of dietary sodium within the context of both a control diet and the DASH diet; 2) the effect on blood pressure of the DASH diet, relative to the control diet, at each of the three levels of sodium intake. The study also assessed whether the effect on blood pressure of going from higher to lower sodium diets differs for participants in the control and DASH diets. Lastly, the study determined whether the blood pressure effect associated with reducing sodium from the higher to the intermediate level differs from the blood pressure effect associated with reducing sodium from the intermediate to the lower level, that is, testing whether the blood pressure effects of sodium are linear across sodium levels for each diet.
Recruitment and screening began in August 1997. The first cohort began the experimental diets in January 1998 and the last cohort completed the diets in November 1999. A total of 412 participants were enrolled into the study. Results were presented at the annual meeting of American Society of Hypertension in May 2000.
The study was renewed under R01HL57114 to to analyze the data of the trial The hypothesis to be tested is that genetic makeup modulates the BP effects of DASH diet and reduced sodium intake through one or more of the following mechanisms: 1) effects on vascular tone; 2) effects on mineralocorticoid regulation of sodium homeostasis; and 3) effects on non-classical regulation of sodium homeostasis.
Intervention Model: Parallel Assignment, Primary Purpose: Prevention
diet, fat-restricted, diet, sodium-restricted
National Heart, Lung, and Blood Institute (NHLBI)
Published on BioPortfolio: 2014-08-27T04:00:03-0400
To determine if nonpharmacological interventions, including diet and lifestyle change, could prevent increases in arterial blood pressure leading to systemic hypertension.
This study is designed to address the hypothesis that in obese patients with type 2 diabetes mellitus (DM), a low carbohydrate diet not specifically restricted in calories compared to low ...
The purpose of this study is to examine the effectiveness of the South Beach Diet™ and South Beach Diet™ products compared to a traditional calorie restricted diet.
To compare the effectiveness of advice versus two multicomponent lifestyle interventions to control blood pressure in participants with Stage 1 hypertension or higher than optimal blood pr...
To test the efficacy of weight loss and sodium restriction, alone and combined, in maintaining the normotensive state following withdrawal of antihypertensive medications in an elderly coh...
Ketogenic diets (KDs) are increasingly utilized as treatments for epilepsy, other neurological diseases, and cancer. Despite their long history in suppressing seizures, the distinct molecular mechanis...
Although long-term energy restriction has been widely investigated and has consistently induced improvements in health and cognitive and motor functions, the responses to short-duration calorie restri...
Inflammation may be a mechanism of maternal programming because it has the capacity to alter the maternal environment and can persist postnatally in offspring tissues. This study evaluated the effects...
Intrauterine growth restriction increases the risk of developing chronic diseases in adulthood. Lifestyle factors, such as poor dietary choices, may elevate this risk. We determined whether being born...
Background Neonatal diabetes mellitus (NDM) is defined as a monogenic form of diabetes that occurs in the first 6 months of life. As information on diet in NDM patients successfully treated with sulfo...
A diet which contains very little sodium chloride. It is prescribed by some for hypertension and for edematous states. (Dorland, 27th ed)
A diet that contains limited amounts of CARBOHYDRATES. This is in distinction to a regular DIET.
A diet that contains limited amounts of fat with less than 30% of calories from all fats and less than 10% from saturated fat. Such a diet is used in control of HYPERLIPIDEMIAS. (From Bondy et al, Metabolic Control and Disease, 8th ed, pp468-70; Dorland, 27th ed)
A diet that contains limited amounts of protein. It is prescribed in some cases to slow the progression of renal failure. (From Segen, Dictionary of Modern Medicine, 1992)
Regular course of eating and drinking adopted by a person or animal. This does not include DIET THERAPY, a specific diet prescribed in the treatment of a disease.
Within medicine, nutrition (the study of food and the effect of its components on the body) has many different roles. Appropriate nutrition can help prevent certain diseases, or treat others. In critically ill patients, artificial feeding by tubes need t...
Pulmonary arterial hypertension (PAH) is a chronic, life-threatening disorder characterized by abnormally high blood pressure in the arteries between the heart and lungs of affected individuals. Symptoms can range from mild breathles...
Cardiology is a specialty of internal medicine. Cardiac electrophysiology : Study of the electrical properties and conduction diseases of the heart. Echocardiography : The use of ultrasound to study the mechanical function/physics of the h...