Concept2 Forum

The best measure is a VO2 max test. Next best is probably some FTP equivalent to cycling. 3rd best is the HRR.
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I am confused by the responses justifying why their personal volume or circumstances or holding a job mean that they don't need to work at a level where there is minimal lactate buildup. The original poster was asking why there is so much disagreement between models and how to know where to train if...

They're only guides the formulas anyway - if you don't actually know the max (not sure if you do, as you said using 165 vs using highest observed etc), then anything you do plug in a little more than a guess anyway - further making the values less meaningful.