title: Sedentary behaviour and physical activity in bronchiectasis: a cross-sectional study.
abstract: BACKGROUND
  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.
  
  
  METHODS
  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.
  
  
  RESULTS
  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).
  
  
  CONCLUSIONS
  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.
  
  
  BACKGROUND
  NCT01569009 ("Physical Activity in Bronchiectasis").
authors.affiliation: Centre for Health and Rehabilitation Technologies, Institute for Nursing and Health Research, Ulster University, Newtownabbey, Northern Ireland, UK. jm.bradley@ulster.ac.uk.
authors.forename: Judy M
authors.initials: JM
authors.lastname: Bradley
authors.affiliation: Centre for Health and Rehabilitation Technologies, Institute for Nursing and Health Research, Ulster University, Newtownabbey, Northern Ireland, UK. wilson-j25@email.ulster.ac.uk.
authors.forename: Jason J
authors.initials: JJ
authors.lastname: Wilson
authors.affiliation: Centre for Health and Rehabilitation Technologies, Institute for Nursing and Health Research, Ulster University, Newtownabbey, Northern Ireland, UK. drkathrynhayes@gmail.com.
authors.forename: Kate
authors.initials: K
authors.lastname: Hayes
authors.affiliation: Northern Ireland Clinical Research Network: Respiratory Health, Belfast Health and Social Care Trust, Belfast, Northern Ireland, UK. Lisa.Kent@belfasttrust.hscni.net.
authors.forename: Lisa
authors.initials: L
authors.lastname: Kent
authors.affiliation: Centre for Health and Rehabilitation Technologies, Institute for Nursing and Health Research, Ulster University, Newtownabbey, Northern Ireland, UK. s.mcdonough@ulster.ac.uk.|UKCRC Centre of Excellence for Public Health (Northern Ireland), Belfast, Northern Ireland, UK. s.mcdonough@ulster.ac.uk.
authors.forename: Suzanne
authors.initials: S
authors.lastname: McDonough
authors.affiliation: UKCRC Centre of Excellence for Public Health (Northern Ireland), Belfast, Northern Ireland, UK. m.tully@qub.ac.uk.|Centre for Public Health, School of Medicine, Dentistry and Biomedical Sciences, Queen's University, Belfast, Northern Ireland, UK. m.tully@qub.ac.uk.
authors.forename: Mark A
authors.initials: MA
authors.lastname: Tully
authors.affiliation: Centre for Health and Rehabilitation Technologies, Institute for Nursing and Health Research, Ulster University, Newtownabbey, Northern Ireland, UK. ian.bradbury2010@gmail.com.
authors.forename: Ian
authors.initials: I
authors.lastname: Bradbury
authors.affiliation: School of Psychological Sciences and Health, University of Strathclyde, Glasgow, Scotland, UK. alison.kirk@strath.ac.uk.
authors.forename: Alison
authors.initials: A
authors.lastname: Kirk
authors.affiliation: Northern Ireland Clinical Research Network: Respiratory Health, Belfast Health and Social Care Trust, Belfast, Northern Ireland, UK. Denise.Cosgrove@belfasttrust.hscni.net.
authors.forename: Denise
authors.initials: D
authors.lastname: Cosgrove
authors.affiliation: Southern Health and Social Care Trust, Craigavon Area Hospital, Craigavon, Northern Ireland, UK. Rory.Convery@southerntrust.hscni.net.
authors.forename: Rory
authors.initials: R
authors.lastname: Convery
authors.affiliation: Western Health and Social Care Trust, Altnagelvin Area Hospital, Derry, Northern Ireland, UK. Martin.Kelly@westerntrust.hscni.net.
authors.forename: Martin
authors.initials: M
authors.lastname: Kelly
authors.affiliation: Centre for Infection and Immunity, School of Medicine, Dentistry and Biomedical Sciences, Queen's University, Belfast, Northern Ireland, UK. s.elborn@qub.ac.uk.
authors.forename: Joseph Stuart
authors.initials: JS
authors.lastname: Elborn
authors.affiliation: Centre for Health and Rehabilitation Technologies, Institute for Nursing and Health Research, Ulster University, Newtownabbey, Northern Ireland, UK. b.oneill@ulster.ac.uk.
authors.forename: Brenda
authors.initials: B
authors.lastname: O'Neill
mesh_terms: D061725:Accelerometry; D000368:Aged; D001294:Attitude to Health; D015992:Body Mass Index; D001987:Bronchiectasis / Q000503:physiopathology*; D003430:Cross-Sectional Studies; D004734:Energy Metabolism; D005080:Exercise Test; D005260:Female; D005541:Forced Expiratory Volume; D006801:Humans; D016013:Likelihood Functions; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D009042:Motivation; D009043:Motor Activity; D011788:Quality of Life; D057185:Sedentary Behavior; D020377:Self Efficacy; D012720:Severity of Illness Index; D013147:Spirometry; D011795:Surveys and Questionnaires