Today I did a shortened version of the infamous 'Hour of Power' devised by Bill Black. It's based around 60 minutes at a solid 90% FTP (for me 275W) with 15 sec bursts to 150% FTP (450W) every 2 mins and 45 secs. In the hour you should complete 20 bursts and 20 tempo intervals between.
There are lots of variations of the ratio of power but I looked at 90/150 and thought it would be achievable although I only planned to do 54 minutes as part of a 60 min workout. I'm going to add another 3 mins until I get to the full 60 plus warm-up and cool-down.
It started off well enough until I got to the 12th burst (the big red A) when I suddenly felt pretty crappy and was happy to back off and recover for 45 seconds or so. This also ties in with my highest HR and not being able to achieve the 450W burst. Luckily my HR strap was working today so it's easy to see that my HR was nowhere near it's 175 LTHR and only up to a measly 167-170 for the 6 mins leading up to the A. I know from experience that I usually suffer if I stay in this HR zone for too long so I'm not surprised that I hated it today, though I'm always cautious to not look at HR during the workout because I don't want it to make me think about stopping when I get up to these levels.
After the A I seemed to settle down a bit and just had a bit of weakness immediately after the bursts and then I did the last burst as an all-out 30 secs at 400W. And then I was done and beaten by Bill.
Next time I won't do anything different except stick to the 275W intervals and add another interval to take it up to 19 bursts. The time after that will be 20 intervals.
Overall stats for the 54 minutes:
Work done - 945 kJ
Average power - 290W
Average HR 160
Relative Intensity .93