Decreasing activity limits for asthma patients.

Asthma disproportionally affects children, minorities, and people who live in urban areas ((1,2)) and is characterized by periodic episodes of wheezing, shortness of breath, tightness in the chest, increased mucus production in the lungs, and fatigue ((3,4)). Approximately 90% of all asthmatic patients experience exercise-induced asthma (EIA) that may develop slowly during exercise, with symptoms returning or intensifying during recovery ((4)).