Metformin to Treat Obesity in Children With Insulin Resistance
This study will examine the safety and effectiveness of the medicine metformin to help overweight children control their food intake, weight, insulin, cholesterol, and triglyceride (blood fat) levels. Obesity and high insulin levels can lead to high blood pressure, diabetes, high cholesterol and triglyceride levels and heart disease. Metformin-approved by the Food and Drug Administration to treat adults with type 2 diabetes mellitus-helps lower insulin levels and may control weight gain in adults.
Overweight children 6 to 11 years old who are in general good health may be eligible for this study. Children will be studied at the National Institutes of Health in Bethesda, Maryland. Candidates will have a medical history and physical examination and fasting blood test, and will provide a 7-day record of their food intake as part of the screening process. Those enrolled will be randomly assigned to receive either metformin or placebo (a look-alike tablet with no active medicine) twice a day for a six month period. After the 6 month study period, all children will be offered the opportunity to take metformin for another 6 months.
Participants will be hospitalized for 2-3 days for the following procedures: history and physical examination; fasting blood test; several urine collections; X-ray studies to determine bone age and amount of body fat and muscle; magnetic resonance imaging (MRI) scan to measure body fat; "hyperglycemic clamp study" to evaluate insulin resistance; food intake testing; nutrition consultation; resting metabolic rate; and a "doubly labeled water" test.
For the hyperglycemic clamp study, a catheter (thin flexible tube) is inserted into a vein in each arm. A sugar solution is given through one tube and blood samples are drawn every 5 minutes through the other to measure insulin. For the food intake testing, the child is asked about his or her hunger level, then given various foods he or she may choose to eat, then questioned again at various intervals both during and after finishing eating about his or her hunger level. The doubly labeled water study involves drinking "heavy water" (water which is enriched to have special kinds of hydrogen and oxygen). Urine specimens are collected 2, 3 and 4 hours after drinking the water. The child also drinks a special milk shake called a Scandishake and repeats the calorie intake and hunger study. (Two food intake studies are done on separate days.) One week after the heavy water test, additional urine samples are collected one week later.
After completing the tests, the child will begin treatment with metformin or placebo, plus a daily vitamin tablet. Participants will be followed once a month with a brief history and physical examination, including a blood test. After 6 months, all of the tests described above will be repeated. All children who complete the second round of tests-both those who took metformin and those who took placebo-will be offered metformin for an additional 6 months and will be seen once a month for follow-up evaluations. Parents will not be told which children received metformin and which received placebo until all children in the study complete the first 6 months of the trial.
|Study Design:||Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
|Official Title:||Effects of Metformin on Energy Intake, Energy Expenditure, and Body Weight in Overweight Children With Insulin Resistance|
- Changes in Body Weight as Determined by Body Mass Index-standard Deviation Score (BMI-SDS). [ Time Frame: 6 months ]Change in Body Mass Index standard deviation score (BMI-SDS) determined using tables created by the CDC in 2000. BMI-SDS is a unitless transformation of the body mass index (measured in kg divided by the squared height in meters) using the L M S method. Possible values range from -3 to +3. See http://www.cdc.gov/growthcharts/percentile_data_files.htm for details.
- Change in Body Weight as Determined by BMI [ Time Frame: 6 months ]Change in body weight as determined by body mass index (kg/m2)
- Change in Body Weight [ Time Frame: 6 months ]Change in body weight (kg)
- Change in Body Fat by DEXA [ Time Frame: 6 months ]Change in body fat mass by Dual Energy X-Ray Absorptiometry (kg)
- Change in Body Fat by Bod Pod [ Time Frame: 6 months ]Change in body fat mass measured by air displacement plethysmography (kg)
|Study Start Date:||May 2000|
|Study Completion Date:||May 2011|
|Primary Completion Date:||August 2009 (Final data collection date for primary outcome measure)|
Active Comparator: 1 - Metformin HCL
Subjects receive metformin plus a weight loss program
Drug: Metformin HCL
Medication studied for ability to alter body weight and body composition.
Placebo Comparator: 2 - Placebo
Subjects receive placebo plus a weight loss program
Control capsules for metformin
Please refer to this study by its ClinicalTrials.gov identifier: NCT00005669
|United States, Maryland|
|National Institutes of Health Clinical Center, 9000 Rockville Pike|
|Bethesda, Maryland, United States, 20892|
|Principal Investigator:||Jack A Yanovski, MD, PhD||NICHD, NIH|