the inability to perform repeated efforts at the power corresponding to 100% of VO2max could also be due...

これもだな．
http://www.cyclingforums.com/showpost.php?p=2810945&postcount=5

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Some semi-random thoughts:

1) the plateau or quasi-plateau in power at the end of a pursuit-like 5 min effort provides a very good estimate of power at VO2max. However, it could overestimate it slightly if you held back a bit early on and spread your AWC out over the entire duration, versus going flat-out as in, e.g., a race, and then hanging on by the skin of your teeth to the very end.

2) the inability to perform repeated efforts at the power corresponding to 100% of VO2max could also be due:

A) VO2 drift, i.e., your VO2 is truly maximal but your power is down due to reduced efficiency, or

B) inadequate fatigue resistance of your muscles, thus preventing you from repeatedly driving your VO2 to maximum. (This is why 1) I think Lydiard had it right, and 2) why I don't favor the training schema advocated by Dave Morris, in which VO2max training is performed before training of LT.)

Regardless of any of the above, I wouldn't worry too much about the difference between 385 W and 360-365 W. The latter is certainly high enough to provide a potent stimulus for increasing your VO2max, so if that's all you can do, so be it. The frequency with which you do such workouts and your motivation when doing them likely has a lot more to do with how much benefit you obtain than the precise intensity at which you do such intervals.
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このスレッドのOPのFTPは325Wらしいから，385W≒118%FTP，365W≒112%FTPになる．
どちらでもゾーン内だからOK，それよりトータルボリュームに気を使えと．