ENCORE: Exercise and Nutritional Interventions for Cardiovascular Health - Full Text View

Purpose

This study is an NIH-funded clinical trial conducted at Duke Medical Center evaluating the effects of the DASH diet alone and combined with a behavioral weight loss program on blood pressure and various vascular measures. Eligible patients must be unmedicated with blood pressure values ranging from approximately 130/85 to 159/99. Our primary hypothesis are as follows: (1) The DASH diet alone and combined with a behavioral weight management program will result in greater BP reductions than Usual Care controls at the end of the 4 month treatment period; (2) The DASH diet in combination with a behavioral weight management program will be more effective in lowering BP than the DASH diet alone; (3) The DASH diet alone and the DASH diet combined with the behavioral weight management program will result in greater improvements in cardiac, metabolic, and vascular function compared to the control condition; and (4) The combined DASH diet and weight management intervention also will be the most effective treatment in maintaining BP reductions at 1-year follow-up.

Condition	Intervention
Hypertension	Behavioral: DASH diet Behavioral: DASH diet plus Weight loss


Study Type:	Interventional
Study Design:	Allocation: Randomized Endpoint Classification: Efficacy Study Intervention Model: Parallel Assignment Masking: Single Blind (Outcomes Assessor) Primary Purpose: Treatment
Official Title:	Behavioral Treatment of High Blood Pressure

Resource links provided by NLM:

MedlinePlus related topics: Exercise and Physical Fitness High Blood Pressure Weight Control

U.S. FDA Resources

Further study details as provided by Duke University:

Primary Outcome Measures:

Blood pressure [ Time Frame: 4 months ] [ Designated as safety issue: No ]

Secondary Outcome Measures:

Ambulatory blood pressure,vascular function,left ventricular geometry, glucose tolerance,body composition, quality of life [ Time Frame: 4 months ] [ Designated as safety issue: No ]


Enrollment:	144
Study Start Date:	October 2003
Study Completion Date:	July 2013
Primary Completion Date:	July 2009 (Final data collection date for primary outcome measure)

Arms	Assigned Interventions
Experimental: DASH diet	Behavioral: DASH diet Participants in the DASH diet condition receive instruction in modifying the content of their diet to meet DASH guidelines. Participants are explicitly asked not to exercise or to attempt weight loss at this time, and to focus their attention on what they eat. Following the 2-week feeding period, participants will receive instruction on the DASH diet and feedback on their adherence to the diet in a series of half-hour, weekly small group sessions (3 to 5 participants).
Experimental: DASH diet plus Weight loss	Behavioral: DASH diet plus Weight loss Participants in the DASH diet plus weight loss condition will receive the DASH dietary intervention as described in the DASH diet intervention and will participate in a program to promote weight loss consisting of 2 components: Supervised Aerobic Exercise and CBWL (Cognitive Behavioral Weight loss). During supervised exercise participants will exercise 3x/week under medical supervision at the Duke Center for Living. A trained exercise physiologist will supervise all exercise sessions, and will obtain exercise BP measurements to make sure that BP is not abnormally elevated. For the CBWL participants will meet in small groups of 3-5 patients for instruction in weight management techniques. CBWL will include Appetite Awareness Training (AAT), a self-monitoring strategy developed to provide more specific guidelines regarding how much to eat. Individuals learn to identify moderate hunger and fullness and use these internal cues to guide their eating.
No Intervention: Usual Care Usual Care Control Group: Patients in the Usual Care control group will be asked to maintain their usual dietary and exercise habits for 4 months until they are re-evaluated. At biweekly intervals we will ask patients to describe any spontaneous changes in their eating habits or food preferences. To ensure patient safety, BPs will also be monitored biweekly by our staff.

Detailed Description:

The present application seeks to extend previous findings by a) evaluating the efficacy of the DASH diet in a free-living situation; (b) considering the DASH diet alone and in combination with a behavioral weight loss program including aerobic exercise; (c) examining the impact of diet and exercise on cardiac, metabolic, and vascular function, including measures of arterial stiffness, endothelial function, baroreflex control, body composition, insulin resistance, cardiac hemodynamics, and left ventricular (LV) geometry and mass; and (d) following patients for one year to determine the longer term impact of the interventions on BP, body weight, and cardiovascular function.

Eligibility


Ages Eligible for Study:	35 Years and older
Genders Eligible for Study:	Both
Accepts Healthy Volunteers:	Yes

Criteria

Inclusion Criteria:

Baseline SBP 130-159 mmHg (+/- 2mmHg) or DBP 85-99 mmHg (+/- 2 mm Hg)
Age 35 years or older
BMI 25.0-39.99 kg/m², with a maximum weight of 300 lbs
Willing and able to participate fully in all aspects of the intervention
Must currently be sedentary (less than 3x/wk for 30 mins each time)
Informed consent

Exclusion Criteria:

Use of weight-loss medication and/or participation in a structured weight- loss program in the 3 months prior to 1st screening visit.
Regular use of an anti-hypertensive drug or other drugs that raise or lower BP and if discontinued use, must be off for 1 month before screening
Current use of insulin or oral hypoglycemic agents
Current use of medications for treatment of psychosis or manic-depressive illness.
ADHD medications (Ritalin/Aderol/amphetamines
Cardiovascular Event
Coronary Artery Disease
Congestive Heart Failure
Current symptoms of Angina for peripheral vascular disease
Cancer diagnosis (except for non-melanoma skin cancer) or treatment in past 2 years
Fasting blood sugar >126 mg/dl
Gastric Bypass/Bariatric Surgery
Pyschiatric hospitalization in the past 2 years.
Unable or willing to consume all of the dietary foods provided during the 2-week feeding.
Consumption of more than 21 alcoholic drinks per week or binge drinking
Alcoholism as determined by the Alcohol AUDIT (screening questionnaires)
Planning to leave the area prior to the anticipated end of participation
Body weight change of >15lbs in the 3 months prior to the 1st screening visit
Pregnant, breast feeding, or planning pregnancy prior to end of participation
Current participation in another clinical trial until after completion of T2
Investigator discretion for safety or adherence reasons
Controlled substance abuse

Contacts and Locations

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00571844

Locations


United States, North Carolina
Duke University
Durham, North Carolina, United States, 27710

Sponsors and Collaborators

Duke University

National Heart, Lung, and Blood Institute (NHLBI)

Investigators


Principal Investigator:	James A. Blumenthal, Ph.D.	Duke University

More Information

Publications:

Svetkey LP, Harsha DW, Vollmer WM, Stevens VJ, Obarzanek E, Elmer PJ, Lin PH, Champagne C, Simons-Morton DG, Aickin M, Proschan MA, Appel LJ. Premier: a clinical trial of comprehensive lifestyle modification for blood pressure control: rationale, design and baseline characteristics. Ann Epidemiol. 2003 Jul;13(6):462-71.

The sixth report of the Joint National Committee on prevention, detection, evaluation, and treatment of high blood pressure. Arch Intern Med. 1997 Nov 24;157(21):2413-46. Erratum in: Arch Intern Med 1998 Mar 23;158(6):573.

Blumenthal JA, Sherwood A, Gullette EC, Babyak M, Waugh R, Georgiades A, Craighead LW, Tweedy D, Feinglos M, Appelbaum M, Hayano J, Hinderliter A. Exercise and weight loss reduce blood pressure in men and women with mild hypertension: effects on cardiovascular, metabolic, and hemodynamic functioning. Arch Intern Med. 2000 Jul 10;160(13):1947-58.

Appel LJ, Moore TJ, Obarzanek E, Vollmer WM, Svetkey LP, Sacks FM, Bray GA, Vogt TM, Cutler JA, Windhauser MM, Lin PH, Karanja N. The effect of dietary patterns on blood pressure: results from the Dietary Approaches to Stop Hypertension (DASH) clinical trial. N Eng J Med. 336:1117-24, 1997

Sacks FM, Svetkey LP, Vollmer WM, Appel LJ, Bray GA, Harsha D, Obarzanek E, Conlin PR, Miller ER 3rd, Simons-Morton DG, Karanja N, Lin PH; DASH-Sodium Collaborative Research Group. Effects on blood pressure of reduced dietary sodium and the Dietary Approaches to Stop Hypertension (DASH) diet. DASH-Sodium Collaborative Research Group. N Engl J Med. 2001 Jan 4;344(1):3-10.

Blumenthal JA, Sherwood A, Gullette EC, Georgiades A, Tweedy D. Biobehavioral approaches to the treatment of essential hypertension. J Consult Clin Psychol. 2002 Jun;70(3):569-89. Review.

Linden W, Chambers L. Clinical effectiveness of non-drug treatment for hypertension: a meta-analysis. Ann Behav Med. 16:35-45, 1994.

Jeffery RW. Weight management and hypertension. Ann Behav Med. 13:18-22, 1991.

Windhauser MM, Evans MA, McCullough ML, Swain JF, Lin PH, Hoben KP, Plaisted CS, Karanja NM, Vollmer WM. Dietary adherence in the Dietary Approaches to Stop Hypertension trial. DASH Collaborative Research Group. J Am Diet Assoc. 1999 Aug;99(8 Suppl):S76-83.

Svetkey LP, Simons-Morton D, Vollmer WM, Appel LJ, Conlin PR, Ryan DH, Ard J, Kennedy BM. Effects of dietary patterns on blood pressure: subgroup analysis of the Dietary Approaches to Stop Hypertension (DASH) randomized clinical trial. Arch Intern Med. 1999 Feb 8;159(3):285-93.

Hinderliter A, Sherwood A, Gullette EC, Babyak M, Waugh R, Georgiades A, Blumenthal JA. Reduction of left ventricular hypertrophy after exercise and weight loss in overweight patients with mild hypertension. Arch Intern Med. 2002 Jun 24;162(12):1333-9.

Blumenthal JA, Siegel WC, Appelbaum M. Failure of exercise to reduce blood pressure in patients with mild hypertension. Results of a randomized controlled trial. JAMA. 1991 Oct 16;266(15):2098-104.

Additional publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):

Hinderliter AL, Sherwood A, Craighead LW, Lin PH, Watkins L, Babyak MA, Blumenthal JA. The long-term effects of lifestyle change on blood pressure: One-year follow-up of the ENCORE study. Am J Hypertens. 2014 May;27(5):734-41. doi: 10.1093/ajh/hpt183. Epub 2013 Oct 1.

Epstein DE, Sherwood A, Smith PJ, Craighead L, Caccia C, Lin PH, Babyak MA, Johnson JJ, Hinderliter A, Blumenthal JA. Determinants and consequences of adherence to the dietary approaches to stop hypertension diet in African-American and white adults with high blood pressure: results from the ENCORE trial. J Acad Nutr Diet. 2012 Nov;112(11):1763-73. doi: 10.1016/j.jand.2012.07.007. Epub 2012 Sep 19.

Blumenthal JA, Babyak MA, Sherwood A, Craighead L, Lin PH, Johnson J, Watkins LL, Wang JT, Kuhn C, Feinglos M, Hinderliter A. Effects of the dietary approaches to stop hypertension diet alone and in combination with exercise and caloric restriction on insulin sensitivity and lipids. Hypertension. 2010 May;55(5):1199-205. doi: 10.1161/HYPERTENSIONAHA.109.149153. Epub 2010 Mar 8.

Blumenthal JA, Babyak MA, Hinderliter A, Watkins LL, Craighead L, Lin PH, Caccia C, Johnson J, Waugh R, Sherwood A. Effects of the DASH diet alone and in combination with exercise and weight loss on blood pressure and cardiovascular biomarkers in men and women with high blood pressure: the ENCORE study. Arch Intern Med. 2010 Jan 25;170(2):126-35. doi: 10.1001/archinternmed.2009.470.


Responsible Party:	Duke University
ClinicalTrials.gov Identifier:	NCT00571844 History of Changes
Other Study ID Numbers:	Pro00007858, 5 R01 HL074103, 4842
Study First Received:	December 10, 2007
Last Updated:	July 11, 2014
Health Authority:	United States: Institutional Review Board

Keywords provided by Duke University:


High Blood Pressure Exercise Diet Biomarkers

Additional relevant MeSH terms:


Hypertension Cardiovascular Diseases Vascular Diseases

ClinicalTrials.gov processed this record on February 25, 2015