Slow chest compression: The patient will receive in a randomized order the application or not of SCC for one minute immediately after 6MST and 6MWT. During the SCC, the patient will remain in the sitting position; a bimanual slow compression on his/her upper chest will be performed always by the same evaluator, who will stand behind the patient. This compression will be done only in the expiratory phase, during one minute, in all respiratory cycles, respecting the chest mobility of each patient. For all patients, during SCC, it will be given a standardized verbal command: "Exhale all the air". After the test in which the patient will not receive the SCC, he/she must remain seated, at rest, for one minute without any interventions, although it will be given the same standardized verbal command.