The online version of this article (doi:10.1186/s12890-015-0046-7) contains supplementary material, which is available to authorized users.
Judy M Bradley, Jason J Wilson, Joseph Stuart Elborn and Brenda O’Neill contributed equally to this work.
The authors declare that they have no competing interests.
JB had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. JB, JW, KH, LK, SMcD, MT, IB, AK, JSE, BO’N contributed substantially to the concept or study design, data acquisition, data analysis and interpretation, and the writing or revision of the manuscript. DC, RC, MK contributed to data acquisition and revision of the manuscript. All authors have approved the final manuscript.
Judy M Bradley and Jason J Wilson were joint first authors. J Stuart Elborn and Brenda O’Neill were joint senior authors.
The impact of bronchiectasis on sedentary behaviour and physical activity is unknown. It is important to explore this to identify the need for physical activity interventions and how to tailor interventions to this patient population. We aimed to explore the patterns and correlates of sedentary behaviour and physical activity in bronchiectasis.
Physical activity was assessed in 63 patients with bronchiectasis using an ActiGraph GT3X+ accelerometer over seven days. Patients completed: questionnaires on health-related quality-of-life and attitudes to physical activity (questions based on an adaption of the transtheoretical model (TTM) of behaviour change); spirometry; and the modified shuttle test (MST). Multiple linear regression analysis using forward selection based on likelihood ratio statistics explored the correlates of sedentary behaviour and physical activity dimensions. Between-group analysis using independent sample t-tests were used to explore differences for selected variables.
Fifty-five patients had complete datasets. Average daily time, mean(standard deviation) spent in sedentary behaviour was 634(77)mins, light-lifestyle physical activity was 207(63)mins and moderate-vigorous physical activity (MVPA) was 25(20)mins. Only 11% of patients met recommended guidelines. Forced expiratory volume in one-second percentage predicted (FEV1% predicted) and disease severity were not correlates of sedentary behaviour or physical activity. For sedentary behaviour, decisional balance ‘pros’ score was the only correlate. Performance on the MST was the strongest correlate of physical activity. In addition to the MST, there were other important correlate variables for MVPA accumulated in ≥10-minute bouts (QOL-B Social Functioning) and for activity energy expenditure (Body Mass Index and QOL-B Respiratory Symptoms).
Patients with bronchiectasis demonstrated a largely inactive lifestyle and few met the recommended physical activity guidelines. Exercise capacity was the strongest correlate of physical activity, and dimensions of the QOL-B were also important. FEV1% predicted and disease severity were not correlates of sedentary behaviour or physical activity. The inclusion of a range of physical activity dimensions could facilitate in-depth exploration of patterns of physical activity. This study demonstrates the need for interventions targeted at reducing sedentary behaviour and increasing physical activity, and provides information to tailor interventions to the bronchiectasis population.
NCT01569009 (“Physical Activity in Bronchiectasis”)
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- Sedentary behaviour and physical activity in bronchiectasis: a cross-sectional study
Judy M Bradley
Jason J Wilson
Mark A Tully
Joseph Stuart Elborn
- BioMed Central
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