A wearable cardiopulmonary and metabolic equipment (K5, Cosmed, IT).  This system is used during the cardiopulmonary exercise test. It allows us to know the physiological state and the exercise capacity of an individual. It allows to evaluate not only the electrocardiographic behavior under stress but also the metabolism, in particular ventilation, oxygen consumption and carbon dioxide production during physical activity. It is capable to measure the most important metabolic parameters: VO2, VCO2, Ventilation, HR, energy expenditure.