NCT03790410.

Methods	Study design: RCT Study grouping: parallel‐group
Participants	Baseline characteristics Inclusion criteria Stable COPD Do not take part in other treatment Be able to learn the usage of inspiratory muscle trainer Exclusion criteria Acute exacerbation Balance problems with a neurological cause The patient unable to cooperate Participation in pulmonary rehabilitation 3 months before the study IMT use in the 3 months before the study
Interventions	Intervention characteristics PR+IMT: PR consists of breathing exercises, bicycle ergometer conditionings, relaxations, and strength and endurance training. IMT consists of strengthening exercises on the diaphragm muscle. PR: This group undertook only PR.
Outcomes	Respiratory muscle strength: PImax
Notes