Aren't you supposed to try and hold a constant power throughout the test (as much as possible)?
My average power was 315w (from training peaks) so shouldn't I try holding at 320w from the beginning?
In that case I'd start at 315w.
You managed 315 having started at 285. So it's not a bad strategy.
As Dammit says. It's personal. But recovery from over doing it, is far harder than ramping after starting too easy.
Also, starting at 315w is going to hurt.
@Smallfurry started
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Aren't you supposed to try and hold a constant power throughout the test (as much as possible)?
My average power was 315w (from training peaks) so shouldn't I try holding at 320w from the beginning?