Then my question is how do you prepare for a sport where you elevate your HR to the 175+ range without elevating your heart that high in a workout? You can't maintain that kind of exertion through a typical steady state workout.
I dropped my HIIT for several weeks, partly based on your comments. It was quite a while before I noticed any drop off, but I did get more gassed in my advanced class and during seminars. I picked it back up about three weeks ago, and by last week, even my dojo mates noticed how much better I've been doing. The more intense the class, the better I do relative to everyone else. It's great when everyone else is getting gassed and I'm getting my second wind.