 High school elite training programs are today more and more under development in several elite sport schools in Belgium, in order to select and train future elite athletes already at young age. Little is known about the effects of sustained training on the potential development of asthma in adolescents during lung growth. It would be of great importance to be able to select the individuals at risk to develop exercise-induced asthma, already at the start of their enrollment in the elite sport school. This would allow physicians to follow their lung function parameters very closely and regularly; and, if necessary, start treatment early after the first signs of exercise-induced asthma. 