Vitamin C reduces bronchoconstriction

Vitamin C can reduce bronchoconstriction and found to 

adverse respiratory symptoms in swimmers by 50%

Physical activity increases oxidative stress, and therefore, as an antioxidant vitamin C might have particularly evident effects on people who are participating in vigorous exercise. In several studies, vitamin C administration attenuated the increases in oxidative stress markers caused by exercise.

Vitamin C is involved in the metabolism of histamine, prostaglandins, and cysteinyl leukotrienes, all of which appear to be mediators in the pathogenesis of exercise-induced bronchoconstriction.

A meta-analysis of three studies found that vitamin C halved post-exercise in participants who suffered from exercise-induced bronchoconstriction. Five other studies examined subjects who were under short-term, heavy physical stress and a meta-analysis revealed that vitamin C halved the incidence of respiratory symptoms. 

Another trial reported that vitamin C halved the duration of the respiratory symptoms in male adolescent competitive swimmers.

Allergy, Asthma & Clinical Immunology Dec 2014

#asthma #swimming #breathing #vitamin