Originally Posted by
Carbonfiberboy
I
No, what they mean by oxidative flux is the amount of oxygen consumed, nothing to do with intensity. This model works equally well for the trained and untrained: they don't do anything differently. The untrained just process less oxygen for the same RPE and thus go slower. It may be true that the untrained will have less trouble working beyond VT2 than a trained athlete, but I doubt it.
It doesn't appear to be that simple though. As they continue., "This magnitude of cellular energy turnover coupled with therelatively long duration the workloads are sustained appears sufficient to provide an effective stimulus for the induction of the various genes involved in mitochondrial biogenesis "
Apparently the authors believe that the energy turnover per muscle mass is an operative factor, not simply the quantity of O2 2 consumed.