For those of you who TT with a powermeter, how do you use it to pace yourself? This morning was the first time I've tried, and I think it caused me to be too conservative. I tried to shoot for 370-380, which I believe to be my threshold range (my max 20 min is 390 on a HCTT a few weeks back). I guess I should have limited to over my threshold, but I'm not at all used to riding in aerobars and it's naturally harder for me to get high power on the flats. I also ruined my time, wasted energy, and got out of my zone by missing a turn and having to backtrack, then accelerate back to speed. For a nearly all flat course (but with significant wind changes), it looks like I also have too many oscillations in my power.
The most confusing thing for me now, looking back at the data, is how high my heart rate was, even though I felt I was throttling myself too much. I started picking it up too late, and from the fact I was able to average 470 in the last minute, I must have had too much left in the tank at the end. From testing a year ago, my heart rate at LT was 179-180 or so (max 201), and this is supported by a drop off in my heart rate histogram there for hard rides. Yet my average heart rate here was 187... and I've seen an avg of 184 for a 2+ hour climbing intensive road race.
I attached a shot of the wko file with a gridline at 385. Anyone care to share insight about my threshold power, high heart rate, etc from this? If this had been a maximal 20 min, Coggan would say to subtract 5%, giving me 355-360, but I don't think that's right for this.