Free diving-inspired breathing techniques for COPD patients: A pilot study

This pilot study evaluated the safety and effectiveness of a six-week training program consisting of free diving-inspired breathing techniques in nine patients with moderate-to-severe COPD in Denmark. The co-primary endpoints were 6MWD and time taken to complete a stair climbing test. As part of the study, patients underwent spirometric testing using a Vitalograph Pneumotrac device.