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TLDR: Hippy, go ride your bike.
Is this weather? I'm so over that.
I let AI FTP Detection take another few % off my forever crumbling FTP too. I might go and ride the Crux on the turbo at lunch to see if my last saddle adjustments were better or worse. But idiots keep breaking things and that's just enough to keep me from standing up...
For a 20 min FTP test you will tend to get about the same result (95% of the average 20min power) whether the subject attempts to pace the effort, fails a bit at the end or has enough gas to sprint the final minute. That’s why it’s one of the better tests. I’ve done 100s of them with subjects and it always works out. The only important bit is to make sure you don’t shoot your bolt way too early and fail with like 10 minutes left.
Like people say it’s just an educated arbitrary figure to help you prescribe specific training.
An MMP test is a better pre-emptor for FTP than a simple ramp though.
Usually the protocol (for endurance riders) would be a ramp to establish MHR and zones, then MMP for power and FTP to tie them together. Lactate testing and a proper VO2 as well if you have it. Specificity is important but you want the whole picture to establish pre-trained or genetic strengths and weaknesses.
TLDR: Hippy, go ride your bike.