BACKGROUND: Exercise-induced @entity1576 are common among adolescents. Exercise is a known stimulus for transient narrowing of the airways, such as exercise-induced bronchoconstriction (EIB) and exercise-induced @entity3885 (EILO). Our aim was to investigate the prevalence of EIB and EILO in a general population of adolescents. METHODS: In this cross-sectional study, a questionnaire on exercise-induced dyspnoea was sent to all adolescents born in 1997 and 1998 in Uppsala, Sweden (n=3838). A random subsample of 146 adolescents (99 with self-reported exercise-induced dyspnoea and 47 without this condition) underwent standardised treadmill exercise tests for EIB and EILO. The exercise test for EIB was performed while breathing dry air; a positive test was defined as a decrease of >= 10% in FEV1 from baseline. EILO was investigated using continuous laryngoscopy during exercise. RESULTS: The estimated prevalence of EIB and EILO in the total population was 19.2% and 5.7%, respectively. No gender differences were found. In adolescents with exercise-induced dyspnoea, 39.8% had EIB, 6% had EILO and 4.8% had both conditions. In this group, significantly more @entity1 than @entity1 had neither EIB nor EILO (64.7% vs 38.8%; p=0.026). There were no significant differences in body mass index, lung function, diagnosed @entity565 or medication between the @entity1 with exercise-induced dyspnoea who had or did not have a positive EIB or EILO test result. CONCLUSIONS: Both EIB and EILO are common causes of exercise-induced dyspnoea in adolescents. EILO is equally common among @entity1 and @entity1 and can coexist with EIB.

Prevalence of exercise-induced bronchoconstriction and exercise-induced XXXX in a general adolescent population.

@entity1 :: ('9606', 'Species') :: ['participants', 'girls', 'boys'] @entity565 :: ('MESH:D001249', 'Disease') :: ['asthma'] @entity3885 :: ('MESH:D008173', 'Disease') :: ['laryngeal obstruction'] @entity1576 :: ('MESH:D012131', 'Disease') :: ['respiratory symptoms']
@entity3885 :: (MESH:D008173,Disease) :: ['laryngeal obstruction']
