After a little advice from the collective please:-)
Last night I did two short races on Zwift, each around 25 mins long. I was using it as 2x20 min sweetspot session. I rode on RPE rather than to power. However the figures were pretty decent and I was wondering if there was any way of interpreting them to estimate current FTP?
The first ride was a 20 min power PB, but HR was within sweetspot range, VI of 1.05. The second ride my 20 min power was 98% of the first, HR again where I would expect for sweetspot, and VI of 1.00. There was 20 mins recovery between the efforts.
Is there any way of using those rides to estimate FTP without testing?