Surface electromyography (EMG), and a multipair esophageal electrode catheter system will be used during CWR exercise to evaluate respiratory muscle recruitment, respiratory effort and neural drive to the different respiratory muscles. The catheter will be inserted to continuously record Pes (esophageal pressure), Pgas (gastric pressure) and EMGdi (electromyogram of the diaphragm muscle). PesMax (maximal esophageal pressure), PgasMax (maximal gastric pressure) and PdiMax (maximal transdiaphragmatic pressure) will be obtained during maximal sniff and cough maneuvers. Transcutaneous surface electromyography (sEMG) techniques will be applied to scalene, sternocleidomastoid and parasternal intercostal muscles to register neural drive to these respiratory muscles. With this measurements, the investigators will be able to assess whether there are any changes in respiratory muscle recruitment patterns and respiratory neural drive to the different respiratory muscles after IMT.