that would depend upon his efficiency…
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Yee’s VDOT from his Valencia 10km would put his threshold pace around his 20k to 21k pace.
So my question could his threshold be close to 20km isnt crazy or highly unlikely imo.
I’m going to circle this back to…it depends what you mean by threshold.
Is this horse definitely dead yet, or do we need to lay the boot in a few more times to be sure?
It has made me think critically most of the day about the subject, so for me it was a worth while exchange.
Which one, are they really thresholds?
So called Anaerobic Threshold, I’m going with the simple once you go over xxxxxxxxx xxxxx then xxxxx xxxxx depending on your xxxxxxxxx cxxxxxxx
PS Applogies to the OP for going off topic.
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I would have thought LT1 and LT2 are as close to a measurable physiological boundaries of intensity as you can get?
Always goes off topic…
Well in my humble understanding, the different muscle fibres and energy systems used graduate very much in an analogue way as efforts increase and decrease.
So, too, the apparent thresholds in physiology be it ftp, lactate or otherwise, don’t describe a flip from one to another they describe an apparent steady state in the transition of the ratios in which fibre types and energy systems are being used.
Man, that’s a lot more complicated when I type it out than think it.
But it doesn’t stop there, the muscle fibres types themselves in some cases can change from aerobic to anaerobic in function.
All of which is really just to say, that when we say “I will do this exercise and get that adaptation from it”, it’s really a lot more vague and imprecise than that.
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That depends upon his efficiency
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correct…
LTP1 and LTP2 possibly…but this varies from person to person…
I added that in my deleted post. (Which was a reply to another deleted post.)
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But Isn’t lactate production itself a step away from actual work done, it’s a by product with a close relationship?
So while it may be a clear indicator of blood acidification and exceeding the metabolic ability to clear lactate, it’s still a proxy indicator for effort/load/adaptation stimuli.
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Not really, its a fuelling mechanism. By product is hydrogen ions, or so the current belief is according to my source.
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yes…but if this is in response to my efficiency point…who knows how efficient yee would be over 21k based on his 10k…making any assumption, requires lots of assumptions…and the only way of removing those assumptions is for yee to train specifically for 21k…
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Not sure anyone suggests otherwise but it is working with the information available.
I just move a bit on most days and move a bit faster on rarer days. 
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Agreed, the problem arising though is when inferences are made - and they are - that lead to an absolutist position on a training model such as purely Z2.
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On a MUCH less technical note
33 kms this week at 11 kph ( all t mill ) gradually reducing hr hopefully to near 130 bpm is real z2 training … not just talking about it … I think … hope ?!?
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I can only think of Maffatone who would say solely Z2 but even then he accepts you need to spice things up a bit. No one sensible has anyone doing solely Z2 do they? I wouldn’t say that is a training model.
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First question is How do you define Zone 2 
Then it depends where someone is in their athletic history, what their goals are, what their weaknesses are, are they triathletes or just runners/cyclists.
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Definitions aside (because you know what Z2 is already), Z2 improvement is a long-term project. Starting today and until London, you might only add 15 watts to your Z2 pace but if you run the whole marathon at Z2 pace it should come easy for you.
If you want to run harder on race day you should add some Z3 in the final weeks. The events you’re training for won’t benefit from Z4 as much as the risk they pose you.
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Just …
Lol
Z2 running in paticular seems to bring decent rewards, improved cardio, less risk of injury and faster recovery from slower runs.
I get if you want to run fast … you have to run fast at some stage.
I’m training with guy who is just a runner ha ha he’s 58, ran a 17:30 t mill 5 k last week and runs virtually every day.
A very clever fella, yet he can’t understand why his knee aches ?!?
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