Exercise-induced asthma is a condition in which physical exertion triggers asthma symptoms such as shortness of breath, coughing, and wheezing. Some research suggests that antioxidant nutrients may help reduce symptoms in certain individuals.
In a small study presented at the World Congress of Asthma (Buenos Aires, October 19, 1999), Japanese researchers examined the effect of vitamin C on exercise-induced asthma in children who were not regularly using asthma medications. The children were evaluated at baseline and then given 2,000 mg of vitamin C per day for four weeks.
At the end of the study period, participants underwent an exercise challenge test. Eight of the 17 children reported fewer asthma symptoms during exercise, along with improvements in lung function. While the study was small and preliminary, it suggested a potential role for vitamin C in reducing exercise-related asthma symptoms in some patients.
Other research has suggested that oxidative stress may contribute to exercise-induced bronchoconstriction, and that antioxidants in general may help support airway function. Larger, well-controlled studies are needed to determine which patients are most likely to benefit.
Other studies have shown that antioxidants in general help this condition.
