I heard this thread had turned into something about 
and then there’s something cool to comment on. You’re really paying attention, nice work. What I want to note is glycogen depletion and increasing motor unit recruitment as causes of fatigue are not mutually exclusive, they’re compatible. The big question is whether that glycogen go away aerobically or anaerobically. The fatigue may in part be due to metabolite accumulation since typically after an FTP block I see 1min power go up a whole lot (with zero training) and that is an indicator of buffering capacity improvement. And we wouldn’t develop that capacity without some stimulus, ergo it must be a dimension of the fatigue. In other words, nobody’s wrong here. Good discussion, a pleasure to read.
And on the topic of FTP semantics, whether someone’s TTE gets out to an hour or more or not is just one factor to consider of many; the context of where someone is in a long training block tells me whether an assessment (via a workout or the wko5 model) of 60’ or more TTE means FTP has gone up, or if it’s the same and just gotten longer. On the subject of FTP as a number, what I’ve tried to do, and TR is also trying to do, is take the guesswork out and develop a methodology that’s the shortest point between training and fitness assessment. TR seems to think it’s okay to fail a couple workouts to adjust your FTP, but for what people pay me, I don’t. Probably because I’ve been trained as a scientist, I like to isolate variables, so barring total stupidity on my part (which does happen 2-3x per year) I can isolate a relatively rare workout failure quickly to something like recovery, diet, stress, or sleep, rather than wondering if FTP is set too high. I obviously also use coaching cues and read feedback for even more information so instead of workouts getting pass/fail, the approach gets to be more nuanced.
Hi @Rizzi, I’ve never seen these protocols before but wouldn’t assign either one of them to any athletes with the purpose of raising vo2max unless they were just off the couch, and in that case just riding endurance and middle intensity intervals would do the same job just fine. You could pretty easily justify swapping those intervals for their intended targets.