Aragon wrote:
LeMond most likely was on the right track about this one, but just assuming that there is almost 1 to 1 interpersonal correlation between Vo2MAX and Watts produced at threshold simply isn't true as there are other factors such as lactate threshold and gross efficiency having an effect on the latter figure.
He was dumbing it down a bit for the masses. He's extremely well-versed when it comes to power and was one of the early adopters to using power in general. The upper limit of Threshold/Vo2Max is around 90% for guys like Boardman and the like, so LeMond will have known that with a VO2max of 78 and at his weight it simply would not have been possible for Armstrong to hold that sort of power on 30'+ climbs.
At 73kgs with a VO2max of 78 I would predict his threshold to be approximately 406w if he was holding 90% of his VO2max, which is exceptionally high. That means he could "only" hold 475w for about 10 minutes.
You are absolutely right, though, there is a large difference from one person to the next. I've found most guys are in the 75% range for threshold:vo2max, and those up in the 90% range are either "extra-terrestrial" or extreme slow-twitchers.