Intensity of training is an important parameter in obtaining training effects [1, 2]. In most studies on training in COPD patients, the target training intensity has been based on a percentage of the obtained maximal workload during an incremental exercise test . However, some authors reported that patients were unable to obtain the indicated intensity of 70% of the maximal workload , while others trained patients with a similar degree of airflow obstruction without mentioning such complaints . The maximal workload in the last step of the incremental exercise test is often not described in detail in the literature, but most investigators and clinicians will consider a minimum duration of 20 s. However, a more important confounding factor in using maximal workload as indicator of maximal exercise capacity is its dependence on the size of the increments during an incremental exercise test .
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