There have been multiple such studies, but Moritani et al. (Ergonomics 1981; 24(5):339-50) appear to have been the first. (There are multiple review articles out there on the critical power concept, so I suggest that you start your reading with one of those.)



That is correct: most people use anaerobic capacity and anaerobic work capacity interchangeably, whereas I prefer to keep them separate (just as I once was careful to draw a distinction in a review paper between splanchnic glucose production measured using the a-v balance approach and whole-body glucose Ra measured using an isotopic tracer, even though many sloppily (IMO) refer to both as "hepatic glucose production"). You will note, though, that while I feel that this distinction is useful, I also recognize that it is my invention (as is the use of "metabolic fitness" as a synonym for LT, comparable to how "cardiovascular fitness" is used as a synonym for VO2max), and thus don't thrust it upon others (this thread only went in this direction when someone asked what I meant).



Because the conclusion that the y-intercept is an indicator of anaerobic capacity is based upon application of the model under conditions/experiments in which it does NOT break down.