St. Louis, Missouri 63110


Purpose:

Obesity is one of the most widespread health problems of today, with more than 61 million adult Americans considered obese. Abdominal obesity (AO), in particular, is associated with an increased chance of cardiac diseases, such as coronary artery disease, and related risk factors, such as high blood pressure and type 2 diabetes mellitus (T2DM). Despite the known association between AO and cardiac disease, the mechanisms responsible for this relationship are still not well understood. Recent obesity studies have indicated that increased delivery of fats to the heart may play a role in heart function impairments. This study will evaluate the impact of AO on the human heart's use of fats for energy and on heart function.


Study summary:

Obesity is defined as having a high amount of excess body fat. Millions of people worldwide meet the criteria for obesity, making it one of the most pressing current health issues. The more body fat a person has, the more susceptible that person is to a number of life threatening diseases, including heart disease, type 2 diabetes, gallstones, certain cancers, and high blood pressure. A variety of factors can lead to obesity. These factors include family history and genetics, physical inactivity, metabolism, hormone imbalance, and environment. Past research suggests that an increased availability of fats in the body leads to increased fat uptake by the heart. The heart only needs a certain amount of fat for energy, which leaves the remaining fat in the heart tissue, possibly impairing proper heart function. However, more information on the mechanisms behind the effects of fats on heart metabolism is needed. This study will evaluate the impact of AO on the human heart's use of fats for energy and on heart function. This study will enroll both overweight and lean participants who will attend 4 to 7 study visits. Visit 1 will consist of various screening tests, including a medical history, physical exam, pregnancy test if applicable, routine blood test, and an echocardiogram (ECHO) performed before and during exercise. Visit 2 will consist of an abdominal fat and insulin sensitivity study. This will entail a magnetic resonance imaging (MRI) test to image the heart and stomach, a dual energy x-ray absorptiometry (DEXA) scan to measure total body fat and muscle content, and an insulin sensitivity test to measure how well the hormone insulin controls blood sugar. The latter test will require multiple blood draws over a 3-hour period. Visits 3 and 4 will occur over a 2-week period. Both visits will consist of an overnight stay at the General Clinical Research Center (GCRC) followed by a day of imaging studies. During Visit 3, participants will first undergo a 4-hour whole body metabolism study, which will include injection of a nonradioactive tracer through previously placed IVs, blood draws, and breathing into a machine for approximately 15 minutes. Participants will then undergo a positron emission tomographic (PET) heart metabolism study, which will also involve tracer injections and blood draws. A resting ECHO test will also be done during the PET study. Participants will be asked for permission to store a sample of their blood for a period of up to 10 years to be used in future research studies on the heart. During Visit 4, participants will undergo repeat tests from the third visit, except the PET study will evaluate the heart's ability to use sugars instead of fats. This will complete the study visits for all lean participants and some overweight participants and will entail 4 weeks of participation. Overweight participants may be asked to attend an additional three study visits during an 8-month weight management program at Washington University School of Medicine. Participants will aim to lose 10% of their body weight over a 6-month period and to maintain that weight loss for another 1- to 2-month stabilization period. At the end of the stabilization period, participants will undergo repeat abdominal fat and insulin sensitivity studies during Visit 5, repeat whole body metabolism and heart metabolism studies during Visit 6, and repeat whole body metabolism and glucose heart metabolism studies during Visit 7.


Criteria:

Inclusion Criteria: - Class II abdominal obesity body mass index (BMI) between 35 kg/m2 and 39.9 kg/m2; waist circumference of greater than 90 cm in women and greater than 105 cm in men - Diagnosis of type 2 diabetes - Sedentary lifestyle Exclusion Criteria: - History of cardiovascular disease - Regular exerciser - Occupy a strenuously active job - No evidence of inducible myocardial ischemia on resting/stress ECHO - No risk factors of coronary artery disease, heart valve disease, or left ventricular dysfunction - Left ventricular hypertrophy (based on measure in left ventricular mass index) - No evidence of coronary artery disease based on clinical parameters or on rest/stress ECHO


NCT ID:

NCT00572624


Primary Contact:

Principal Investigator
Robert Gropler, MD
Washington University Medical School

Debi Delano, MSN
Phone: 314-747-3876
Email: delanod@mir.wustl.edu


Backup Contact:

Email: kruppk@mir.wustl.edu
Kitty Krupp, RN
Phone: 314-747-0183


Location Contact:

St. Louis, Missouri 63110
United States



There is no listed contact information for this specific location.

Site Status: Recruiting


Data Source: ClinicalTrials.gov

Date Processed: November 24, 2017

Modifications to this listing: Only selected fields are shown, please use the link below to view all information about this clinical trial.


Click to view Full Listing

If you would like to be contacted by the clinical trial representative please fill out the form below.