title: Distinct Trajectories of Physical Activity Among Patients with COPD During and After Pulmonary Rehabilitation.
abstract: Little is known about longitudinal trends in objectively measured physical activity (PA) during and after pulmonary rehabilitation (PR) for individuals with Chronic Obstructive Pulmonary Disease (COPD). The purpose of this study was to examine the PA trajectories of patients with COPD during and after PR and whether demographic, clinical, or program characteristics differed across these trajectories. The study was approved by Research Ethics Boards at all participating institutions, and written informed consent was obtained from each participant prior to study inclusion. COPD patients (N = 190) completed a questionnaire and wore a pedometer for 7 days at baseline, end of PR, and 3 and 9 months after completing PR. Latent class growth analyses showed that two distinct PA trajectories emerged. Active Maintainers averaged 9177 steps/day at baseline, and maintained this level throughout the assessment and post rehabilitation period. In contrast, Inactive Maintainers averaged 3133 steps/day at baseline, which also remained stable during and after PR. Follow-up analyses showed the Inactive Maintainers were more likely to be retired from work and have lower baseline scores for their stress tests and 6-minute walk tests compared to Active Maintainers (all p < 0.05). These results suggest that two distinct steps/day trajectories exist for COPD patients during and after completing PR that are partially explained by specific demographic and clinical characteristics.
authors.affiliation: a Department of Applied Human Sciences, Faculty of Science , University of Prince Edward Island , Charlottetown , Prince Edward Island , Canada.
authors.forename: Travis J
authors.initials: TJ
authors.lastname: Saunders
authors.affiliation: b Faculty of Medicine, Dalhousie University , Halifax , Nova Scotia , Canada.|d School of Physiotherapy, Dalhousie University , Halifax , Nova Scotia , Canada.
authors.forename: Gail
authors.initials: G
authors.lastname: Dechman
authors.affiliation: b Faculty of Medicine, Dalhousie University , Halifax , Nova Scotia , Canada.
authors.forename: Paul
authors.initials: P
authors.lastname: Hernandez
authors.affiliation: e Faculty of Physical Education & Recreation, University of Alberta , Edmonton , Alberta , Canada.
authors.forename: John C
authors.initials: JC
authors.lastname: Spence
authors.affiliation: f Behavioural Medicine Laboratory , University of Victoria , Victoria , British Columbia , Canada.
authors.forename: Ryan E
authors.initials: RE
authors.lastname: Rhodes
authors.affiliation: g School of Human Kinetics , Laurentian University , Sudbury , Ontario , Canada.
authors.forename: Kerry
authors.initials: K
authors.lastname: McGannon
authors.affiliation: h New Brunswick Heart Centre, Horizon Health Network , Saint John , New Brunswick , Canada.
authors.forename: Stephen
authors.initials: S
authors.lastname: Mundle
authors.affiliation: i Cape Breton Heart Lung Wellness Centre, Cape Breton District Health Authority , Sydney , Nova Scotia , Canada.
authors.forename: Carol
authors.initials: C
authors.lastname: Ferguson
authors.affiliation: j Montreal Chest Institute , McGill University Health Centre , Montreal , Quebec , Canada.
authors.forename: Jean
authors.initials: J
authors.lastname: Bourbeau
authors.affiliation: k Institut Universitaire de cardiologie et de pneumologie de Québec, Université Laval , Québec , Canada.
authors.forename: Francois
authors.initials: F
authors.lastname: Maltais
authors.affiliation: l Division of Respirology, Critical Care and Sleep Medicine , University of Saskatoon , Saskatoon , Saskatchewan , Canada.
authors.forename: Darcy D
authors.initials: DD
authors.lastname: Marciniuk
authors.affiliation: m Department of Physical Therapy , University of British Columbia , Vancouver , British Columbia , Canada.
authors.forename: Pat G
authors.initials: PG
authors.lastname: Camp
authors.affiliation: b Faculty of Medicine, Dalhousie University , Halifax , Nova Scotia , Canada.|c Capital District Health Authority , Halifax , Nova Scotia , Canada.
authors.forename: Chris
authors.initials: C
authors.lastname: Blanchard
mesh_terms: D061725:Accelerometry; D000368:Aged; D005080:Exercise Test; D005081:Exercise Therapy; D005260:Female; D015438:Health Behavior; D006801:Humans; D008297:Male; D008875:Middle Aged; D009043:Motor Activity; D029424:Pulmonary Disease, Chronic Obstructive / Q000503:physiopathology* / Q000534:rehabilitation*; D012179:Retirement; D011795:Surveys and Questionnaires; D013997:Time Factors; D014797:Vital Capacity
keywords: exercise; latent class growth analysis; pedometers; steps per day