HR zones confusion
I'm a cyclist preparing to get into triathlon. The first step in this preparation is to read a lot about triathlon. For that reason I bought the "All new triathlete's training bible" from Joe Friel. I really liked the book, but there's something that got me confused.
In the book as well as in other books like the 80/20 triathlon and other sources,There's a lot of talk about the importance of zone 2 training (in a 5 zone system). The bulk of your training has to be in zone 2 (low intensity).
At the same time, and I suppose it has to be actually more or less the same thing, It is said that bulk of training has to be at or below the aerobic (or first ventilatory) threshold. It is also said that that threshold is about 20 to 40 bpm below your LTHR (or FTHR or second ventilatory threshold) Joe friel says to take 30 bpm as a guideline.
But... If you look at my FTHR f.e. of 168, this means an aerobic threshold of 138. If you look at the zones as used by Joe Friel (but also in 80/20 triathlon and others) however, the cap of zone 2 is at 89% or 150, while the cap of zone 1 is at 81% or 136. So the zone 1 cap seems a better approximation of aerobic threshold than the zone 2 cap. So 80% of my training should be in zone 1 and zone 2 is actually the so called "no go" zone (usually called zone 3)
My head is spinning. Confused :D.
Hope someone can help me out.
Thanks for reading!