Originally Posted by
echappist
A true anaerobic effort doesn't go much further than 2 minutes, maybe 2.5 if you are really anaerobically gifted. That you are conflating a 4 min effort to be anaerobic suggests that you have no idea what anaerobic means. FYI, a 4.5 min effort at 120%+ is still, by definition, an aerobic effort; it's known as individual pursuit in circles.
If by 'true anaerobic' you mean
purely anaerobic I would agree with those times; but it's a spectrum not a hard line, and there are intensities where anaerobic and aerobic energy systems are both strongly contributing to the effort. To me calling those 3-5' intensities aerobic isn't entirely accurate either.