Originally Posted by
tobey
The claim you mention is if you are doing a zone 2 ride and during the ride increase to zones 3-5 you've adversely affected you zone 2 training. There is a GCN YouTube video that references this by Tadej Pogacar's cycling coach who is a MD. A great Zone 2 video.
https://www.youtube.com/watch?v=dBbK-0vh-d8&t=632s
Yeah, that claim is controversial. Andy Coggan, an exercise physiologist, says there’s no evidence that doing a hard bout in the middle of a zone 2 causes a lingering metabolic shift. Coggan basically say San Milan is full on wrong.