Although regular exercise improves asthma control in adults as measured by the Asthma Control Test (ACT), it has little effect on peak expiratory flow (PEF) variability, according to a study published in Scientific Reports.

The Regular Exercise and Asthma Control Trial was a randomized, controlled trial designed to test the hypothesis that asthma control in adults would be improved by a 24-week exercise intervention. Adult participants with mild to moderate asthma were randomly assigned to a reference group (RG, n=82) or an exercise intervention group (iG, n=82). Participants in the iG group followed an individualized exercise program that included at least 30 minutes of aerobic exercise at least 3 times per week, along with stretching and strength training. Of the 105 participants who completed the trial, 89 (68%) provided sufficient information for analyses (n=44 iG and n=45 RG). The primary end point was asthma control, as measured by the ACT, asthma symptoms, and PEF variability.

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