I have read only the abstract of the paper, as it is not for free available. The standard calculation to estimate CV is the 2 parameter approach. It is recommended to have at least 3 better 4 time-trials. However, some studies show that also 2 TTs gave a good result (2 TTs at the edge of the hyperbolic function, short-long). In my %CV thread, i presented a CV estimation based only on a 5k result, based on IAAF score tables, which seems to work well too.
As we train here below (sub) CV, we do not need W’/D’ (in this 2-paramter approach). (this parameter has indeed problems)
I mentioned the 4th performance parameter, which is durability (additional to LT%, VO2max, CR). Any VT/LT/CV 'threshold' shall not be seen as a constant parameter, it is a variable. CV as well as LT2 goes down it we get tired (i provided some papers here in the past) . And there are day to day variations.
Intensities above CV seems to increase recovery time significant. Therefore, to stay ‘safely’ below CV, you need some kind of safety gap below CV. This gap is individual, but 95%CV is a good starting point (for the method mentioned herein).
The big advantage of CV is, that you do not need neither a step graded lactate testing, where you have to select between 20+ methods to estimate LT2, nor a spiroergometry. A spiroergometry is still considered the gold standard as you know, but it is quite expensive and complex. Also measurement tolerance is there. However, a spiroergometry is the only way to measure VO2max and CR, so it has its value.
CV is available for the broad mass, without any complex measurements and devices, that gives a big plus for it. It also provides the possibility to rank athletes based on CV for a HS or whatever, as it is a great performance index.
P.S (all): Just to clarify: I mentioned Sirpoc, H2F and Coggan in a positve way and my posts were deleted from the moderation. Period.