Inclusion criteria1. Adults 40 years and above.2. Stable (no exacerbations within 4 weeks before startof baseline testing) moderate to very severe COPD,stage II-IV, according to GOLD criteria [1] (that is,forced expiratory volume in one second/forcedvital capacity<0.70, forced expiratory volume inone second<80% predicted).3. Ex-smoker.4. Stable medical treatment (no changes<4 weeksbefore start of baseline testing).5. Living less than 60 km from training facility.Exclusion criteria1. Musculoskeletal, rheumatic, cardiac or neurologicaldisorders that might affect the exercise performancein training and tests.2. Previous lung surgery.3. Acute exacerbations of COPD that require a changein pharmacological management within 4 weekspreceding the start of the intervention.4. Long-term oxygen treatment.5. Participated in organized exercise training, > 2times a week, within 6 months before start ofintervention.6. Body mass index<18 kg/m2.
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