Summary COP researchers have already conducted very important research that must be expanded, including larger and more diverse and better defined populations, with patients around the world, different cardiovascular and non-cardiovascular diseases, tests using a treadmill (more experience with treadmill CPET is needed), and evaluation of the prognostic values of sub-maximal parameters, such as COP and eventually VO 2 at VT1, versus the maximal parameters, such as pVO 2 , VE/VCO 2 slope, and OUES. A clear answer is needed: […]