1)may be true, hard to tell...
2)Don't know
3)You forget one thing:mechanics-speed, Coe was a speed demon but you get even after full rest more and more tired muscular so it gets harder and harder to run 55s even when you are 46-47sec 400m-man and get full rest, running economy would go down and then 1:50s seem very fast.
and here is the difference:when you take two 46sec 400m guys one with a 1:41 best and one with a 2:00 best, guy one should have much more problems running the session in 1:50 than the 2:00 guy -||- in 2:10 because of working out at higher speeds.
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Wello
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RE: Mr. Renato Canova: Could You Please Answer a Question About Effective Ways to Improve the Lactate Threshold?
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