β-adrenoceptors x A1R x A2aR

The purpose of this study is to determine whether taking a combination of caffeine and albuterol three times per day will increase muscle and decrease fat in your child's body and to determine how these medications make your child feel. Albuterol is approved by the FDA for the treatment of asthma. It is not approved to increase muscle and decrease body fat in children.

The purpose of this study is to define a ratio of Caffeine and albuterol that gives a synergistic increase in metabolic rate.