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The only problem with ERG is that it sets the resistance based on your cadence, so if you go up 120 cadence just before the sprint it will be easy to just use the momentum for a few seconds effort.
On the other hand if you're in a fairly low cadence it will hit you like a wall and get harder if you can't speed up the spin.
Max power with a pre set resistance I always find problematic, how much do people put on? At 30% I feel I ran out of gears but more than that it starts feeling like going up a massive gradient, no momentum at all.
Netakure-
Yeah, I was conscious to wait until the interval started before going for it - you can see on on the third interval of the first block I jumped the gun and went up to 115/120 rpm before the resistance could catch up, I think that's when the ERG mode struggles... when I managed to match the cadence closely it seemed ok for a rank amateur like me
mcJ78
Ah - turns out I am actually stupid after all, it's been so long since i changed gears on the turbo I didn't think of manually setting a level then flicking between front rings, although that last block is 5/5 10/10 15/15 - not much time to change gear, ease off then get on it again
I get it that any proper max effort is hamstrung by the trainer trying to set the resistance to a target cadence / power instead of me just ramping up the gears until there's nothing left, but in all honesty I don't think I had more to offer in the first block, maybe the program has my max output pretty much sussed & the ERG settings were fairly close?
edit At the higher end of my output I struggle to get the cadence up above about 105-110, the cadence on the sprints was set to 110 so if I was struggling to hit that perhaps the ERG mode was still working fairly well by increasing the resistance until I hit 110rpm?
Once I forget the trauma of that effort i'll give it another bash on level mode & see if there's a difference - might be a while