Abstract
Background: Longitudinal data on the effect of time and environmental conditions on physical activity (PA) among Chronic Obstructive Pulmonary Disease (COPD) patients are limited, but this is an important factor in the design of trials to test interventions that might impact on it.
Aim: To assess the effect of time and climate conditions (temperature, day length and rainfall) on progression of PA in a cohort of COPD patients.
Methods: This is a prospective, multicentre study, undertaken as part of the EU/IMI PROactive project, where 236 COPD patients were simultaneously wearing two activity monitors (Dynaport MiniMod and Actigraph GT3X). A multivariable generalised linear model analysis was conducted to describe the effect of the explanatory variables on PA measures, over three time points (baseline, 6- and 12-months).
Results: At 12 month follow-up (n=157) there was a significant reduction in all PA measures (Actigraph step count (4284±3533 vs. 3533±293), Actigraph moderate- to vigorous-intensity PA ratio (8.8 (18.8) vs. 6.1(15.7)), Actigraph vector magnitude units (374902.4 (265269) vs. 336240 (214432)), Minimod walking time (59.1(34.9) vs. 56.9(38.7) minutes) and Minimod PA intensity (0.183(0) vs. 0.181(0)). Time had a significant, negative effect on most PA measures, after correcting for climate factors, study centre, age, Forced Expiratory Volume in 1 second %predicted and other confounders. Rainfall was the only climate factor with a negative effect on most PA parameters.
Conclusion: COPD patients demonstrate a significant decrease in PA over 1 year follow up, which is further affected by hours of rainfall, but not by other climate factors.
Footnotes
Cite this article as: European Respiratory Journal 2019; 54: Suppl. 63, PA3423.
This is an ERS International Congress abstract. No full-text version is available. Further material to accompany this abstract may be available at www.ers-education.org (ERS member access only).
- Copyright ©the authors 2019