Single-Dose Cross-Over Study of the Effects of Albuterol-HFA in Exercise Induced Bronchoconstriction

Inclusion Criteria: 1. Male and female subjects, aged 12 - 50 years, and in general good health. 2. A documented history of mild to moderate asthma, for at-least 6-months, requiring inhaled B-adrenergic agonists for symptom control. 3. Having a history of exercise-induced bronchoconstriction, that can be prevented or relieved by the use of an inhaled B-agonist. 4. Satisfying asthma stability requirement, such that over the 30 days prior to the screening, there are no significant changes in asthma therapy and no asthma-related hospitalization or emergency medical visits. 5. Being able to withhold treatment with inhaled bronchodilators and/or restricted medications for the minimum washout periods indicated in Appendix II prior to pulmonary function testing at Screening Visit and Clinical Visits 1, 2 and 3. 6. Having a baseline forced expiratory volume in the 1st second (FEV1) that is greater than nor equal to 65.0% of predicted normal values. 7. Demonstrating a greater than or equal to 20.0%, but \<50.0%, fall in FEV1 during a Standard Exercise Challenge test per current ATS guidance, at Screening. 8. Demonstrating satisfactory techniques in the correct use of metered-dose inhaler (MDIs). 9. Female patients of child-bearing potential being non-pregnant and non-lactating, and using an acceptable method of contraception. 10. Willingness and ability to sign the informed consent and HIPPA forms to participate in this trial. Exclusion Criteria: 1. A smoking history of ≥10 pack-years, or having smoked within the past 12 months prior to Screening. 2. Any current or past significant respiratory diseases that might significantly interfere with pharmacodynamic response to the study drugs, such as cystic fibrosis, bronchiectasis, emphysema, pulmonary malignancies, etc, other than asthma. 3. Clinically significant cardiovascular, hematological, renal, neurologic, hepatic, and endocrine disorders, or psychiatric diseases, or any other significant health conditions that in the opinion of the investigator might interfere with bronchodilator responses. 4. Recent upper or lower respiratory tract infection (within 4 weeks) prior to Screening. 5. Recent (per Appendix II, Part I) use of orally ingested or systemically administered corticosteroids, B-adrenergic bronchodilators, monoamine oxidase inhibitors (MAOIs), tricyclic antidepressants (TCAs), B-blockers, or drugs that affect study drug performance. 6. Taking \>1,000 mcg daily of inhaled beclomethasone dipropionate or budesonide, or \>500 mcg daily of inhaled fluticasone propionate, or taking high doses of other orally inhaled corticosteroids that suggest severe asthma state, in the opinion of the investigator, within four weeks of Screening. 7. Demonstrating clinically significant abnormal 12-lead ECG results, upon Screening. 8. Any significant physical (e.g., musculoskeletal, overweight, etc) conditions that, in the opinion of the investigator, could limit the subject's ability to perform the exercise challenge test. 9. Known intolerance or hypersensitivity to any component of the MDI formulation (albuterol, HFA-134a, oleic acid and alcohol). 10. Known or reasonably suspected substance abuses.