Impact of Physical Activity on Reporting of Childhood Asthma Symptoms.

This study aims to determine the impact of physical activity on asthma symptom reporting among children living in an inner city. Among 147 children aged 5-12 years with physician-diagnosed asthma, we assessed asthma symptoms using twice-daily diaries and physical activity using the physical activity questionnaire for children during three 8-day periods (baseline, 3 and 6 months). Linear, logistic, and quasi-poisson regression models were used to determine the association between physical activity and asthma symptoms; adjusting for age, sex, race, BMI, caregiver's education, asthma severity, medication use, and season. A 1-unit increase in PAQ score was significantly associated with reporting more nocturnal symptoms [risk ratio (RR): 1.03; 95% CI 1.00-1.06], daytime symptoms (RR: 1.04; 95% CI 1.00-1.09), being bothered by asthma (RR: 1.05; 95% CI 1.00-1.09), and trouble breathing (RR: 1.05; 95% CI 1.00-1.10). Level of physical activity should be taken into account in clinical management of asthma and epidemiological studies of asthma symptom burden.