Scott!
Thanks a lot for the answer. Things are clearer now, and, yes, I noticed improvements.
I sync my HR data with Training Peaks, which gave me a threshold notification last may during I skitour, when I was quite in a hurry because of bad weather. If I get it right it would be what you describe as AnT (at 169; it must be higher now after all the mountaineering in the summer), isn’t it?
My main goal is clearly to train for alpinism. A minor goal, however, is, when I do some skimo race for fun (? 😉 ), to not see the champs run by at twice my pace. So that’s why I asked myself how I could improve my pace at maximum effort during a race (and I thought maxVO2 would be the point). Races however are not my main point and could be seen as high intensity training session.
Ciao
Patrick