“…Cardiopulmonary exercise testing (CPET) and the related concept of maximal oxygen consumption (VO 2max ) is considered as the most important indicator of endurance capacity, cardiorespiratory fitness, and health in sports science [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. It measures a variety of variables (i.e., ventilation, VE; heart rate, HR; oxygen saturation, SpO 2 ; ventilatory threshold, VT; expired fraction of oxygen, FeO 2 ; expired fraction of carbon dioxide, FeCO 2 ) linked to metabolic, cardiovascular and pulmonary responses during the CPET [ 7 , 9 ].…”