Medical researchers are exploring several ideas regarding the cause of exercise-induced bronchoconstriction. There may be more than one biological process that can lead to the condition. Researchers do know that in people who experience exercise-induced bronchoconstriction, strenuous exercise sets in motion molecular events that result in inflammation and the production of mucus in the airways.

Factors that may increase the risk of the condition or act as triggers include:

  • Cold air
  • Dry air
  • Air pollution
  • High pollen counts
  • Chlorine in swimming pools
  • Chemicals used with ice rink resurfacing equipment
  • Respiratory infections or other lung disease
  • Activities with extended periods of deep breathing, such as long-distance running, swimming or soccer
Oct. 25, 2014

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