Commentaries on Viewpoint: V̇o2peak is an acceptable estimate of cardiorespiratory fitness but not V̇o2max.

As discussed in the current Viewpoint (2), there have been a number of methodologically different applications of the verification phase for maximal oxygen uptake (Vo2max) over the past decade, incorporating seemingly arbitrary determination criteria. This is not to say that through observation and experiment, a more exact validation cannot be found. But rather, the immediate focus should be on developing updated protocols for accurately identifying Vo2max for various populations...

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