Quote:
Originally Posted by bigbill
Last night I did Zwift on the Richmond course which is about 10 miles with just under 500 feet of climbing, all in the last few miles. I turned and burned on the first lap setting a new PR at around 27 minutes. I flopped and flailed the second lap at 30 minutes but Zwift moved my FTP up to 237w from 229w based on the effort. My average for the hour including warmup and cooldown was 215w. I may try a flat course for an hour just to see.
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For something like this, Zwift is probably taking your best effort power with time and fitting a curve to it. I know that is what Golden Cheetah does. In Golden Cheetah, you can actually select the type of curve fit you want as well as the duration of data (from the last 7 days to all time). Short term movements in your power curve can indicate that you are getting stronger but just beware that any calculation is just that -- a calculation.