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When you say: "Do a lot of endurance work and generally the amount of lactate at EVERY speed will decrease. Do a lot of interval/fast stuff and the amount of lactate at EVERY speed will increase. Depending on the test you use, it's easy to see."
I take your point, but surely the aim of the faster paced training should be to become more efficient at these faster paces also, so that a lower blood lactate concentration can be achieved at the same pace.
I believe training is effective when:
1, blood lactate concentration is lower for the same pace
2, BLC is the same at a faster pace
3, BLC can be maintained at a higher concentration for longer.
#3 has been getting bad press lately,
This used to be refered to as Lactate Tolerance, but since that expression has recently been falling out of favor, the underlying concept has been wrongly discredited.
I am sure that #3 applies even in the Marathon, where the best runners can mantain a high pace and a low BLC for the first 20 miles or so, and then a very fast pace and a higher BLC to the finish.