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Vitamin C may Help Alleviate Exercise-induced Bronchoconstriction, Says Researcher

by Sheela Philomena on  June 13, 2013 at 3:49 PM Research News   - G J E 4
Vitamin C could reduce bronchoconstriction caused by exercise, suggests University of Helsinki researcher.
 Vitamin C may Help Alleviate Exercise-induced Bronchoconstriction, Says Researcher
Vitamin C may Help Alleviate Exercise-induced Bronchoconstriction, Says Researcher
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Exercise-induced bronchoconstriction means the transient narrowing of the airways that occurs during or after exercise. It can cause symptoms such as cough, wheezing and the shortness of breath.

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Formerly, this condition was called exercise-induced asthma. Usually, the diagnosis of exercise-induced bronchoconstriction is based on a 10 percent or greater decline in forced expiratory volume in 1 second (FEV1) caused by exercise.

About 10 percent of the general population suffers from exercise-induced bronchoconstriction, but among some fields of competitive winter sports the prevalence can be up to 50 percent.

Previously, vitamin C was found to halve the incidence of common cold episodes in people enduring heavy short-term physical stress, which indicated that vitamin C might also have other effects on people under heavy physical exertion.

The new systematic review focused on the effect of vitamin C on bronchoconstriction caused by exercise and identified three relevant randomized placebo-controlled trials.

Each of the three identified trials found that vitamin C halved the FEV1 decline caused by exercise challenge test. The pooled estimate of vitamin C effect indicated a 48 percent reduction in the FEV1 decline caused by exercise.

Dr. Harri Hemila concluded that given the low cost and safety of vitamin C and the consistency of positive findings in three randomized trials on EIB, it seems reasonable for physically active people to test vitamin C on an individual basis if they have respiratory symptoms such as cough associated with exercise.

His finding was recently published in BMJ Open.

Source: ANI
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