Field and laboratory exercise challenges for identifying exercise-induced bronchoconstriction

Abstract

Exercise challenge tests are often used for identification of exercise-induced bronchoconstriction (EIB). Optimal test conditions are: Absolute humidity of <10 mg H2O per L; exercise intensity resulting in a sustained increase in minute ventilation to 14-21 times the forced expiratory volume in 1 s or heart rate (HR) to 80-90% of the estimated maximal HR; and exercise duration of 6-8 min. Variability in fitness level and age necessitate individualisation of the exercise protocol. Field tests are subject to variability in test conditions and may have poorer repeatability than laboratory tests that require expensive equipment. However, either challenge test can be employed for the diagnosis of EIB in conjunction with a critical clinical assessment.