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They are both precision instruments. They give us real-time data about our effort. But they are not interchangeable. Allen and Coggan themselves, the first to study the use of the power meter in depth, recognize the difficulty of superimposing the data exactly on the same analysis graph. In the video I discuss in detail the study and use of the zones used for training, both those referring to the FC max (maximum heart rate) and to the FTP (functional threshold power)