I have a question I can’t seem to find the answer to. Why is it that the 8020 Endurance intensity guidelines for Zone 2 power on the bike are generally higher than almost every other program / guidelines?
What I mean is that 8020 Zone 2 is defined as 70-83% of FTP and almost every other guideline I’ve seen has Zone 2 defined as 55-75%, which I think are based on Coggan Power zones? Isn’t Dr. Coggan’s zones based on 8020 philosophy? I guess I am just wondering why there is such a big discrepancy.
The 80/20 Endurance zones system uses the first Ventilatory Threshold (VT1) to determine what is considered low intensity (Zone 1-Zone 2) so <90% Lactate Threshold HR and 50-83% of FTP for cycling zones. This is a big range which allows athletes to have a lot of scope to use RPE for "low intensity training". It's not so much about the system or the zone number themselves as they are all just demarcating a physiological effort for you to train to.