The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
So I would put the zone three as a transition zone where your glycolytic system starts kicking in at a very high rate. because the ATP demand and your fat oxidation says, okay, I think I'm starting to be done here. Now you take over. And that's where you start seeing a decrease in fat. Yet you use fat. So it's not a completely glycolytic state. It's a transition phase.
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Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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In the zone four, that's where we see very, very well that the lactate also you see an inflection point. that kind of where we could see the lactate threshold, where like all of a sudden the lactate accumulation is not steady, it jumps and you see the inflection point. And at the same time, that's where you usually start seeing the R of 1.0, the RQ, and there's zero fat oxidation. So we know very well, it's like if there's a lot of lactate and there's no fat oxidation, that's another metabolic transition point that is indicating that You don't burn fat anymore. It just depends on glucose. Yet you can breathe, and it's probably done in the cytosol. So you're aerobic, and that's the zone four. We'll be calling that lactate threshold, if you will.