What I try and do after doing the ramp test and establishing where I think (of hope) my LT1 is, is to pedal really softly for 5 or so minutes to let the body settle down then do a constant power 30 mins or so about 10 watts below that figure and observe what happens to the alpha1. It looks like you did something similar without the rest period. I think its something to do with once you’ve gone over LT1 it takes a bit of time for it to come down properly. Probably why doing surges on LSD rides can blunt the effect of them. Have you tried use Runalyze. They do an excellent post ride analysis of the fit file. Lots of ways though of interpreting the data. RUNALYZE - Data analysis for athletes
This was a 5 min step test with 30 sec rests between each step. My interpretation is that my LT1 is between 180 & 190W. Being conservative I would say 180W. The LT2 point is more difficult 210W seems to be the point but 220W gives a similar result - so split the difference 215W maybe
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