Trial on the Effect of Budesonide/Formoterol and Inhaled Budesonide Alone on Exercise-Induced Asthma

Inclusion Criteria: * Male or Female Patients aged 12 to 50 years with a diagnosis of asthma for at least 6 months before screening * Baseline FEV1 of 60% to \>100% of predicted * Demonstrate a decrease in FEV1 of 15% or greater from baseline after standardized stepped exercise challenge testing * Taking a constant dose of low-medium dose inhaled steroids for at least 30 days before screening of either: 1. fluticasone, 88 - 440 mcg/d via MDI or 100 to 500 mcg/d via DPI 2. beclomethasone HFA 80 to 480 mcg/day 3. budesonide DPI 180 to 1200 mcg/ d 4. flunisolide 500 to 2000 mcg/d 5. flunisolide HFA 320 to 640 mcg/d 6. mometasone 200 to 800 mcg/d 7. triamcinolone acetonide 300 to 1500 mcg/ d Exclusion Criteria: * Patients already on LABAs, systemic corticosteroids, or other combination inhaled steroids/LABA medications. * Patients not able to safely complete an exercise challenge due to physical constraints outside of their respiratory status. * Patients who are pregnant or plan to become pregnant during the study period. * Patients with a history of hypersensitivity reaction to either formoterol or budesonide. * Patients with any significant disease or disorder which, in the opinion of the investigator, may either put the patient at risk because of participation in the study, or influence the results of the study, or the patient's ability to participate in the study. * Patients with planned hospitalization during the study * Current Smokers or those with a history of 10 pack years of tobacco use or more.