I've determined my LTHR with the 30 minute TT then take the average of the last 20 minutes method suggested by Friel (and others). And I've used that to calculate my zones with Friel's method. Performing anaerobic intervals, it's very difficult to reach zone 5a and zone 5c never happens. My legs give out before I get there.
I did my first race (a crit) on Tuesday and averaged a full 10 BPM higher HR over my LTHR for 23 minutes before a crash in front of my caused me to lose the pack. My max HR was well in to zone 5c. In fact, I spent a total of 20 minutes in zones 5B and 5C.
So my question is, is it normal to run that much higher racing over training? Is it endorphines and adrenaline or am I just training lazy?