Originally Posted by
Carbonfiberboy
I went back and looked at some power/duration curves. Mine are all smooth curves except for a sharp drop off at ~3 X FTP at ~25 seconds. What software do you use to get it to display a histogram of that? Strava only does 25w increments and Elevate only zones. I do keep an eye on my 20' power on the P/D curve, but that's so dependent on the ride, the other riders if any, and the length of the climbs, and thus more dependent on the ride than my fitness.
I use WKO5. It works best if you do it over several rides as long as they're not over such a long period that performance might have changed. Honestly though, I don't use that method much anymore. WKO5's estimates of performance metrics based on the full power/duration curve work well for me.