Originally Posted by
BTinNYC
Looked up ISM and now, in an elementary way, have my head around threshold and how Z2 training works for improving lactate clearing. I'm close to the 90/10 split at 10-12 hrs per week, but now I see the importance of completing the week's long all-Z2 ride.
https://www.trainingpeaks.com/blog/w...ate-threshold/
by Iñigo San Millán
San Millán is a legit scientist and you can't argue with Pogacar's performance, but the claim that working out at LT1
selectively improves lactate and fat metabolism is not well supported and been challenged by authorities like Andrew Coggan. In fairness to San Millán, he couches the claim in properly tentative terms like the real scientist he is, but others not so much.
That said, there are still strong arguments for training in that range, chief among them that it's the way to get volume without digging yourself into a hole.