The aims of the present study are:
1. primary objective: To investigate the changes in physical activity after a 12-month tele coaching intervention (including individualized goal setting, feedback, motivational contacts with coach and a step counter providing direct feedback), compared to a sham group receiving a light coaching intervention (feedback from step counter and static goal setting, without additional motivation or contact with the coach).
2. secondary objectives:
A. Investigate the effect of a 12-month tele coaching intervention on exercise capacity, muscle force, quality of life, physical activity from a patient's perspective, dyspnea-related fear and comorbidities.
B. Confirming previous findings on short-term effects (or lack of effect) of the tele coaching intervention on physical activity, exercise capacity and quality of life, assessed at 6 months.
C. Identifying possible baseline characteristics that are determinants of the change in physical activity after the 12-month tele coaching intervention.
D. Investigating the association between the pattern in vital signs (including physical activity, resting heart rate, heart rate variability, heart rate recovery, oxygen saturation, respiratory rate) as measured by a wearable and the onset of an exacerbation.
E. To explore the relation between dynamic hyperinflation as measured during the six-minutes walk test, physical activity measured at baseline and change in physical activity as result of the intervention.
F. Investigate the effect of an acute exacerbation on functional performance (only in Ghent).
G. Investigate the association between a change in physical activity and autonomic function (only in Ghent).
H. Validity and reliability of wearable devices to measure autonomic function, respiratory rate and oxygen saturation (only in Ghent).
Therefore, the study will include stable patients with COPD (post bronchodilator FEV1/FVC \< 0.70) with no moderate or severe exacerbations in the past month, across all disease severities.
For patients in UZ Leuven and UZ Ghent, the study will consists of 4 clinical visits:
* Visit 1 screening visit
* Visit 2: randomization visit, scheduled 1-2 weeks after visit 1
* Visit 3: short term follow-up visit, scheduled 6 months after visit 2
* Visit 4: long-term follow-up visit, scheduled 12 months after visit 2
Only for patients in UZ Ghent: to investigate the effect of an acute COPD exacerbation on functional performance, an additional visit will take place when the patient experiences an exacerbation after the first 6 months of the study. This visit will take place as soon as possible and maximally 14 days after onset of the symptoms.
If the patient does not experience an exacerbation during the first year of the study, the patient will be followed-up until occurrence of the first exacerbation or up to 30 months (whichever occurs first) with intermediate visits at 18 months and 24 months.
All patients included in the study will be randomized in either the intervention group or sham group:
* A multicomponent tele coaching intervention that consists of 1) education about the importance of physical activity and a one-to-one interview with the coach discussing the motivation and barriers to be active, 2) a step counter providing direct feedback, 3) application installed on a smartphone providing an adaptive goal and daily and weekly feedback and 4) contact with the coach if the patient is not compliant with the intervention, not increasing physical activity or when the patient reports a change in medication. The patient is asked to have a daily interaction with the smartphone application.
* A sham intervention that consist of 1) education about the importance of physical activity and a personal (fixed) goal expressed in terms of steps. The patient is asked to try to reach this goal, 2) a step counter providing direct feedback, 3) application installed on a smartphone only displaying a graph with the activity of the present week and the personal (fixed) goal, 4) contact with the coach if the patient reports a change in medication. The patient is asked to have at least a weekly interaction with the application.
* Only in UZ Ghent: in case of extended follow-up after 12 months, patients will receive the multicompenent tele coaching intervention after 12 months of inclusion in the study.
