After reading the “do you switch off ERG mode?” thread, I thought I’d zoom in on yesterday’s Ebbets workout, as I noticed that the 5 second bursts seemed to be fast-reacting and on-target.
So my example, zoomed in below, is a 5 second burst from 233W to 477W on a 2017 Kickr Snap in ERG mode. You can see that the actual wattage (yellow line) ramped up to the 477W target 1 second early and fell back to 233W also 1 second early. The net effect is a full 5 seconds at the target., which was pretty much the pattern for the whole workout.
Note that the following 233W “valley” is matched perfectly by the Kickr Snap, I think this is helped by not running a super-high gear (I used 50-16).
When the following valley is much lower than 233W, say, 110W, the flywheel speed means I get a 0W reading for a few seconds before the resistance “catches up”, so for workouts with bursts that are interspersed with very low valleys I just select a lower gear to reduce inertia and minimise this zero-effect.