SolarEnergy said:Don't you think there is a distinction ?
You are probably wandering why I am interested by that distinction ?
At the moment, it's just an early curiosity. I don't think I can draw a conclusion, at least not me. But maybe YOU can ? 🙂
I am interested by any limitation. I find it particulary interesting that some be limited by *their legs* while some others are limited by *the O2*.
The way I see it so far, is that those who can easily perform intervals at 100% VO2Max power without even reaching their respiratory compensation point, are simply better trained.
Or are the others overtrained? Or undertrained? I don't know.
I think it's bogus =).
If you are fatigued (which is a nebulous term that includes both actual physiologic conditions as well as psychological overlays) then you will be limited.
Assuming you aren't glycogen depleted, sleepy, depressed, or any number of other reasons to be 'fatigued', the limiting factor in high intensity efforts (lasting more than seconds) is always going to be oxygen delivery.
Assuming you don't have a pathological condition, noone is limited by their breathing ability. Respiratory capacity far outstrips the ability to utilize O2 (again assuming you have normal lungs). People's breathing response to exercise varies, and changes with training, but it is artificial to think there is some separation between 'breathing' and 'legs'. Your breathing responds to what your legs are doing.
You can start here, and use related links...
ncbi.nlm.nih.govquery.fcgiOpen ↗
Scott