In this study the investigators will study the lung function and airway inflammation in elite athletes starting at the elite sport school (age: 12-13 year) and the change in lung function parameters and airway inflammation after 1 and 2 years at the elite sport school in comparison to age-matched controls (exercising at a recreational level, \<4 hours/week).
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Maximal Fall in Forced Expiratory Volume in One-second (FEV1) After Eucapnic Voluntary Hyperventilation (EVH) Test
Timeframe: change from baseline compared to 15 minutes after EVH test