I do my VO2max workouts in erg mode. They have a hard start, and power declines with subsequent intervals.
The reason I went this approach is to prevent myself from going too hard in the initial 1-2 intervals. My HR responds slowly to hard efforts, so if I try to get my HR high in the first interval, i have to push a lot of power and then I’m cooked by intervals 3 and 4, and end up with power somewhere around threshold. Maybe that’s not a bad thing, but I like the consistency of the erg mode workouts, and it allows me to calibrate over time if VO2max workouts are getting easier.
