Originally Posted by
RChung
Typically, VO2Max isn't attained at HRMax; typically, you're way past VO2Max at HRMax. Also, HR doesn't tell you about stroke volume or cardiac output, or mitochondrial density, or a host of other important physiological markers.
That said, Marco isn't looking for a "structural, causal" pathway from HR to VO2Max; he's looking for an equation that fits. That's a lot simpler, and amenable to the kinds of correlative analyses that ML is especially good at.
I was only referring to HR max in the sense that the whole HR range is widely different between individuals of the same fitness level. So I’m not sure how the model can adjust for such individual variation. Especially if it doesn’t even capture an individual’s complete HR range. For example if it measures my HR at 150 for a particular power output, how does it estimate where 150 is relative to my HR max or my LTHR?