pVO2 max = power at VO2 max.

I think it's the power output (in watts) that is generated while cycling at VO2 max

VO2 max is the maximum amount of oxygen taken in and transported to the working muscles to produces energy

The difference between VO2 max and VO2 peak is what the values represent. VO2 max represents the highest running oxygen amount achievable during a high intensity test. V02 peak represents the maximum value that can be reached without having it raised by a boost.

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Armstrong's VO2 max was reported at 85 ml/kg/min