quote:
Originally posted by martinjames:
Thank you, but I am so not smart enough to digest this. For whatever reason, I don't seem to be prone to bonking, so I'm not too worried about depletion (or course, now I'm going to blow up next time out). So it sounds like, on the margin, not much of a difference.
Intellectually, I was envisioning some threshold under which lactic acid doesn't accumulate and that it didn't matter if one was 1% or 10% or 25% under that threshold. I supposeI that's too simple and linear.
Since I understand "no guts no glory," I think that'll have to take the day. It's probably stupid, but I have to finish quickly to drive my kid to his soccer game in Fredericksburg, Virginia that afternoon. That's a good reason, right?
Ah, the issue is more likely that I didn't understand your question!
First, there's the fact that anaerobic threshold and lactate threshold
are two different quantities that generally occur at around the same
place. However, some literature uses them interchangeably. In
the MAF realm, anaerobic threshold (the point where RQ just equals 1,
100% carb used for fuel) is the more important quantity. It's important
because it identifies how much of your precious glycogen store you'll
be using. You're of course talking about lactic acid build-up and clearly
that's a concern, too, but I think it's more commonly a concern in shorter
races when you're going too fast and simply blow yourself up. No doubt,
it can happen in a marathon, too. Then there's the fact that lactic
acid is the byproduct from the use of carbohydrate for energy, so
clearly these quantities are related. Ok, that's a bunch of jibberish
you didn't really need, but if we use the AT definition that I mention
above, you don't want to be too close to it in a marathon, because
you will then run out of glycogen and things will get messy, no
matter what your lactic acid level.
I do agree with using constraints of where your kid has to be at
what time as a guideline for how fast you should be running.
Especially when it works.
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