Exercise-induced bronchospasm (EIB) is defined as acute, reversible bronchoconstriction induced by exercise. Two variations have been described: one with symptoms occurring during exercise and another with symptoms occurring after exercise. How often does each of these patterns occur in children with EIB?

The study included 30 Children with asthma (mean age 12.3 years) and a history of exercise induced symptoms.

Participants underwent an exercise test of 12 minutes at 80% predicted maximum heart rate on a treadmill inside an ice rink where the air was cold and dry. Pulmonary function was measured before and each minute during exercise and at 1, 3 and 5 minutes after exercise. If EIB occurred (fall in FEV1 >15% from baseline), exercise was terminated and albuterol administered.

EIB was revealed in 19 of the 30 subjects. In 12, EIB occurred during exercise between 6 and 10 minutes (mean, 7.75 minutes) with a mean fall in...

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