U-LABA/ICS Effects on Exercise Performance, Vilanterol

Inclusion Criteria: * Age 18-39 * Physically active \> 5 h weekly * Maximal oxygen consumption classified as high or very high Exclusion Criteria: * Diagnosed with severe asthma and been in treatment with long-acting beta2-agonist/corticosteroid * ECG abnormality * ACQ score \> 1.5 * Severe bronchial hyperreactivity as determined by mannitol test * FEV1/FVC ratio \< 0.7 determined with spirometry * Chronic illness determined to be a potential risk for participant during study * In chronic treatment with medication that may interfere with study results * Pregnancy * Smoker * Blood donation during the past 3 months