Respiratory (i.e., intercostal, scalene and abdominal) and locomotor muscle blood flow index (i.e., vastus lateralis) will be simultaneously measured during isocapnic hyperpnea trials as well as during CWR test (at 75% of the peak work rate) before and after IMT according to a previously established method using Near-Infrared Spectroscopy (NIRS) and indocyanine green (ICG). Respiratory (i.e., intercostal, scalene, abdominal) and locomotor muscle (i.e., vastus lateralis) oxygen delivery will be calculated by multiplying blood flow index to arterial oxygen content, the latter will be calculated non-invasively by pulse oximetry. Respiratory (i.e., intercostal, scalene, abdominal) and locomotor muscle (i.e., vastus lateralis) oxygen saturation (Stio2) - an index of oxygen availability reflecting the balance between oxygen supply and demand-, will be recorded continuously during the trial by NIRS.