Worth a read of Guy Thibault’s work around MAP based interval training. Some in the link below
Worth noting that he uses the Canadian ramp test of 3m steps of 25-30w, so a lower number than a TR test. He has a model showing how intervals at different %'s of MAP, at different durations and for different #reps can be ‘equivalent’ in terms of load and ‘difficulty’. He also talks about using intervals at 85% MAP to build endurance while 95-105% of MAP will build MAP etc.
There was also a SciTri episode with a refence to it around 39 mins in
Designing interval training part 2: 10 MORE things you have to know | EP#146