Elevated HR, Lactate reading too high.  Felt really tired.  Quit after 3 20′ intervals instead doing the full four.  Even dropping my training power by 10 watts in the third piece was not enough to bring my HR down into the UT1 zone.

The past 7 session before today, I was able to hold >190W and measured <2.0 in every session. Yesterday, at 193W, my HR was way high, like 10BPM higher than normal, but the lactates were OK (1.9). Today, holding 192W, HR was just as far off and my lactates were 2.3. I dropped down to 190W and measured 2.8 after another 20 minutes, and my HR was at least 5BPM above the top of my aerobic band.

So, here’s my recent history:

I’m struggling to come up with theories for what is going on.
– A little bit of acute over-training. I did a pretty hard 6×750 session yesterday morning
– Early warning of coming down with something (I am otherwise symptom free
– Reading error (I doubt it, I felt like I was working a lot harder today)

I’m also trying to figure out if I should make any adjustments. I am scheduled for another 4×20 tomorrow morning. Things I am thinking about are:
– Pretend today never happened and do a normal session at 190W
– drop back 5W and build back up again
– start to use the BTLS (Boris Theory of Lactate Supression) and do the first 20′ slowing ramping up to 190W

Any opinions?