Abstract
BackgroundFew studies have examined sedentary behaviour in chronic respiratory disease. The limited evidence suggests that increased levels of sedentary behaviour are associated with increased mortality. ObjectivesThis study aimed to compare the level of self-reported sedentary behaviour in people with chronic obstructive pulmonary disease (COPD) and bronchiectasis as well as to identify associations between sedentary time with functional performance measures and health-related quality of life in the chronic respiratory disease group. MethodsAn observational study design was used. Participants completed the Sedentary Behaviour Questionnaire from which average sedentary time (hours/day) was determined. Functional performance was measured using the six-minute walk test, the four-metre gait speed test and the five sit-to-stand test. Health-related quality of life was measured using the St George's Respiratory Questionnaire. Sedentary time was compared between groups using an unpaired t-test. Univariate analysis explored relationships amongst variables. ResultsThe convenience sample consisted of 103 people with COPD [52% male; mean±SD age: 73±9 years, FEV1% predicted: 56±23] and 33 people with bronchiectasis [52% male; 74±8 years, FEV1% predicted: 69±25]. Average self-reported sedentary time in COPD was 7.6±2.7 hours/day and in bronchiectasis was 8.0±4.1 hours/day, with no between-group difference (−0.4, 95% CI −1.7, 0.8). No associations were found between sedentary time and any functional performance outcome or with health-related quality of life. ConclusionThere was no difference in the high sedentary time between people with COPD and bronchiectasis. Sedentary behaviour was not associated with functional performance or disease-related health-related quality of life in people with chronic respiratory disease.
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