Originally Posted by
Dunbar
I went back and looked at CP curve for the entire year. There was very little difference in power at the durations I used to calculate critical power.
And what are those durations?
Note also that's number 6 on the Coggan link you're so fond of, way down the scale towards least accurate. And by number 4 the result is already inaccurate enough to be almost useless.
Again, no matter how hard you try to avoid it, it's simple. What's the best average power you've been able to hold recently for 60 minutes? That's your FTP. Everything else is a guess, some better than others, but a guess nonetheless.