Abstract
Exercise-induced bronchospasm (EIB) is an important problem for many patients with asthma as well as for many allergic rhinitis patients who do not have clinical asthma.’ Both the free-running system and treadmill exercise test are frequently used to make the diagnosis of EIB. Free running is generally recognized to be the most asthmogenic form of exercise. It has been claimed, however, that vigorous treadmill exercise capable of raising the pulse to 170 bpm for 6 min is almost as asthmogenic as free running and is therefore quite useful for eliciting EIB. Furthermore, it has been stated that a greater work load will not increase the incidence of EIB over that achieved with treadmill exercise if the pulse reaches 170 bpm and is maintained at that rate.’ We have utilized both the free running and treadmill tests in 2 large populations of allergic children and adolescents and have attempted to answer 2 questions: (1) Is the similarity between treadmill exercise and free running sufficient to allow either to be used in clinical practice to delineate patients who may be in need of treatment for EIB? (2) Is there any increase in EIB incidence if one raises the pulse to 180 bpm from 170 bpm during the treadmill test?
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