I'm not going to pretend that I understand it all, but I've done a quadrant analysis of 3 recent 2 hour long spirited or hard tempo rides. Outside Ergvideo and Highly Variable Power on Computrainer Constant Power on Computrainer You can draw your own conclusions, if any. I'mnot really sure why my cadence was so high with the ergvideo, maybe I'll work that out one day. Alex Simmons provides expert musings on this over on his blog , I just copied him :-)
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