 Each testing week will have a 3 day salt-controlled diet prior to testing and an approximate 3-hour testing period on Day 4. The 3-hour testing period will include 10 minutes of a baseline rest, 45 minutes of mild stress competitive video game, and 45 minutes of a recovery rest. A total of 4 blood and 4 urine samples will be collected during the 3-hour period. Each blood draw will consist of about 7 teaspoons for a total of 28 teaspoons per week. If female, a pregnancy test will be performed at the beginning of each testing visit screening, first dose-1, test day-1, first dose -2 and test day-2 to confirm that they are not pregnant. The week before testing, the subject will come to the Georgia Prevention Institute or Childrens Research Unit for the First Dose Visit and meet with one of the study physicians who will give me instructions on how to take Avapro. This appointment will last about 2 12 hours. They will take their first dose of Avapro or the placebo and will be monitored for the next 2 hours. If female subject, they will provide a urine sample for a pregnancy test to make sure they are not pregnant before they are given the first dose of the study medication. During this time, their blood pressure will be taken every 15 minutes. 