It's been a long long while since I last did a 20 minutes power test and I really really hated it. I needed to do one, and as I have been lazy and done nothing for the last 2 days I felt like today was the day!
Considering I have recently set a 1 hour PB I was expecting to do at least as well as the 331W I achieved last time, so I set myself a target of 335W. Things started off rather well, I felt in control and had averaged 340W for the first 10 minutes, HR slowly rising to 172 bpm. At this point I started to feel quite powerful and I forgot the most important rule of a successful test; pacing. Between 10 and 13 minutes I averaged 345W and like an idiot, I knew what was going to happen and did nothing about it. I purposely wasn't looking at my HR so I didn't notice it creep up to 175 bpm, but I did start to feel the effect and my power started to drop off after 13 minutes.
By 15 minutes I was in a world of hurt (point A) and by 17 I was seriously considering stopping, sweating profusely and breathing very heavily. At 18 mins (C) I was in tatters and had to shift gear to be able to keep any power so I took 30 seconds to recover and prepare for the final push. HR dropped a little and the clock ticked down, at 19 mins signalling the final push to the finish, averaging 400W for the last 30 secs.
At the end I was completely spent and had to climb off the bike and kneel on the floor, breathing heavily for a full 2 minutes before I was recovered enough to stand up again.
The good news is that I increased my 20 minute power from 331W to 335W since the last test, using the same equipment and conditions. The bad news is that this could just be variations between the 2 tests. I am also very amazed at my ability to do stupid things (go off too hard) and hard things voluntarily (work so hard I can't stand up). If I was being chased by a bear I don't think I could have tried any harder.