whoawhoa said:It was a strange feeling. I was very fresh, and was turning quick lap times. During the interval, basically, it didn't "hurt" like what I have associated with these types of intervals. I was breathing fairly hard, but very little leg burning, drooling, blurry vision, etc. The last few minutes of the interval didn't feel appreciably harder than the first, and the final interval didn't feel especially hard. My theory was perhaps that my FT has rissen so high relative to my threshold that I'm not producing much acidosis during a 5 minute interval? Which had me thinking that I may need a block of v02max work if I am to continue raising threshold.
Personally, I don't find the first 2-3 L5 intervals that painful (4-min @ 1.11-1.12FT for me). Breathing is heavy for sure, and concentration is highly focused, but not a lot of burning and no drooling, grunting, etc. Now, just as L4 is a pretty broad range, so is L5, and there's a world of difference between 1.05FT and 1.2FT. If even the last interval on a 6x5 didn't feel especially hard, then you might be a little low in the range for that duration. You can either push a touch harder (it's easy to go over the edge without a PM, so really just a *touch*) or add a few more minutes in range (or take it easy to avoid burnout and/or overtraining 😉 ). If you get to the last interval and are still feeling spunky, then rip off another one.
Quick lap times are good. Sounds like FT is coming along nicely. 🙂 MTB racing starts pretty soon for you, no?