baseline power levels

I did a power test this past weekend.  I did an all-out 5 minute maximum effort time trial.  I finished with a 436W average, and a max heart rate of 191 bpm.  I'm pretty satisfied with that effort since it's the highest I've ever recorded for that test.  That puts me at around 5.34 W/kg for that test, which is around mid-upper level CAT 2 and bottom of barrel CAT 1 which is pretty much where I am.

This is a pretty crude test to determine VO2max, but I don't want to go into a lab, so this is what I'm using.  I generated the graph above based on a percentage of VO2max.  My heart rates are always higher than the associated power level, so I must be doing something wrong.  Either way, it's pretty easy to tell if you've got the power levels too high because you can't maintain the effort.  A 1 hour temp ride at 318W gets pretty dang hard towards the end, but I can definitely manage it.