BACKGROUND: This study aims to determine the effectiveness of methods of controlled diaphragmatic breathing (CDB) in COPD patient (GOLD I to II). METHOD: 21 persons, 8 women, 13 men (mean age 68 years old) with diagnosed and currently treated tag COPD, and followed up by a lung specialist (FEV1 < 80%). Before study, we measure the PImax and the PEmax (RPM electronic force pick up), and the Respiratory rate (RR), with 2 scales for rest dyspnea (BORG and visuel analogic scale). During the study, we measure oxygen saturation (SaO2), heart rate (HR), trans-coetaneous partiel CO2 pressure (TcPCO2 with a SENTEC System Digital Monitoring). After study, we measure the respiratory rate (RR), rest dyspnea patient satisfaction with a scale scored from 0 to 10. RANDOMIZATION: 2 groups of 11 and 10 patients who had pulled out their type of ventilation: in G1, patients will do the CDB, and in G2 (control group) patients will do spontaneous ventilation (VS). RESULTS: Before and after 15 minutes of exercise we have significant difference for RR, SaO2, HR and scale for rest dyspnea between the 2 groups. After three minutes we decrease TcPCO2 (p < 0.01 by paired t-test) when we used CDB. And after ten and sixteen minutes we improve difference between the two groups for the TcPCO2. CONCLUSIONS: The controlled diaphragmatic breathing efficiency is based on therapist experiences and with this study we want to be Evidence Based of Physiotherapy. This study shows the positive effects of CDB on the TcPCO2. We certainly need to increase the power of our study with more subjects. Level of evidence 2 (therapeutic study): randomised control trial (small number of participants).

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