Heart-Healthy Lenoir Lifestyle Study

Cardiovascular Disease, Obesity

cardiovascular disease, coronary heart disease, obesity, weight loss, genomics

This study aims to reduce cardiovascular disease (CVD) risk and disparities in risk by improving lifestyle factors which underlie the development of CVD. The first steps will involve conducting a comprehensive formative evaluation to assess individual, interpersonal, organizational, community, and policy factors relevant to CVD risk and risk reduction in Lenoir County. This will be followed by a community-based lifestyle intervention program designed to improve eating patterns, promote physical activity, and for those who are interested, support weight loss. A randomized trial comparing the effectiveness of two community based weight maintenance interventions will also be conducted. Community-wide policy and environmental change interventions will also be implemented to support the individual-level interventions, including partnerships with businesses to promote a healthy environment through innovative economic opportunities. In addition, this project will explore genetic factors associated with cardiovascular disease risk and treatment success.

The lifestyle intervention will enroll 350 participants. The initial lifestyle component of this study, which lasts for 4-6 months, will be provided to all participants. Participants may chose from one of two intervention formats, each with 4 contacts: individual counseling with at least one face-to-face visit and the rest face-to-face or by phone or 4 group sessions. The dietary intervention will focus on improving fat and carbohydrate quality. For fat intake, the goals include 2-4 servings per day of polyunsaturated fat primarily from plant sources and minimal intake of trans fat. For carbohydrate intake, the goals include increased intake of whole grains, fruits and vegetables, and beans and reduced consumption of refined carbohydrates. The physical activity intervention will primarily focus on walking with a goal of 7500 to 10,000 steps per day or, for those who do not wish to use a pedometer, 30 minutes of walking a day. Muscle strengthening activities will also be recommended. At the 4-6 month follow-up measures, those who wish to take part in a weight loss study may do so and those who do not will continue in a maintenance of lifestyle intervention. The investigators anticipate approximately 200 participants will take part in the weight loss component of this study, which consists of a 6 month intensive weight loss intervention. Participants may choose from two intervention formats: 16 weekly group sessions or 5 group sessions and 10 phone counseling sessions. The weight loss goal will be 5% of body weight. At the conclusion of this program, those who lose at least 8 pounds and are willing to take part in a 1 year maintenance of weight loss intervention will be RANDOMIZED to one of two maintenance of weight loss programs. One maintenance arm will receive monthly telephone contacts for one year, while the other arm will receive bi-monthly phone contacts. Follow-up measures for all participants will be at approximately 6, 12, 18, and 24 months. Another related part of the project will use a systems approach to develop models integrating clinical and genomic data. Researchers have developed and tested an approach referred to as the SAMARA (Supporting A Multidisciplinary Approach to Research in Atherosclerosis) Project that applies recent, major advances in biomedical and computational sciences at UNC to develop a deeper understanding of human CVD. The Heart-Healthy Lenoir Project will expand studies into the community, using this methodology to: 1) determine the prevalence of genomic risk signatures in high-risk community populations using genome-wide Single Nucleotide Polymorphism (SNP) analysis; 2) develop novel genomic models incorporating high-risk features in this population; and 3) determine whether genomic signatures can be used to predict responsiveness to interventions that underlie CVD disparities. Participants who consent to this component of the project will have a blood specimen obtained at baseline.

United States