I may be wrong here, umd and Wr. But I thought V02s were not "all out" efforts? More of a percentage of power and what you can hold for as many sets.
I take them as if I can't complete 4 of the 5, I went too hard. If I can do more than 5, I didn't go hard enough. And I never bust my ass at the start and see how long I can hold it. I thought that was more of a AWC approach?