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Smith, Maia P.; Berg, Andrea von; Berdel, Dietrich; Bauer, Carl-Peter; Hoffmann, Barbara; Koletzko, Sibylle; Nowak, Dennis ORCID logoORCID: https://orcid.org/0000-0001-7871-8686; Heinrich, Joachim and Schulz, Holger (2016): Physical activity is not associated with spirometric indices in lung-healthy German youth. In: European Respiratory Journal, Vol. 48, No. 2: pp. 428-440

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In lung disease, physical activity improves lung function and reduces morbidity. However, healthy populations are not well studied. We estimate the relationship between spirometric indices and accelerometric physical activity in lung-healthy adolescents. 895 nonsmoking German adolescents without chronic lung disease (45% male, mean +/- SD age 15.2 +/- 0.26 years) from the GINIplus and LISAplus cohorts completed questionnaires, spirometry, 7-day accelerometry and an activity diary. Physical activity was measured as minutes, quintiles and regularity of daily moderate, vigorous and moderate-to-vigorous physical activity (MVPA), participation in sport and active commuting to school. Primary outcomes were forced expiratory volume in 1 s (FEV1), forced vital capacity (FVC), FEV1/FVC and forced expiratory flow at 25-75% of FVC;they were separately correlated with physical activity and adjusted for confounders of respiratory function, including early-life exposures. Adolescents averaged 40 min MVPA per day, typical for European youth. 79% participated in sports and 51% commuted actively. An association was suggested between 3% higher FVC (similar to 100 mL) and either extreme MVPA quintile or percentage of days with >30 min MVPA (p<0.05). However, after Bonferroni correction all associations between spirometry, active lifestyle and physical activity were nonsignificant. Spirometric indices were not significantly associated with active lifestyle or measures of activity in lung-healthy adolescents after adjustment for confounding and multiple-comparison artefacts.

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