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RE: Mr. Renato Canova: Could You Please Answer a Question About Effective Ways to Improve the Lactate Threshold?

Sorry to disagree, but all credible research in the last 15 years shows that the aeorbic processes contribute far more to the energetics of running shorter events that previously defined and described. Indeed, the old way of deriving the anaerobic-aerobic percentages using the oxygen debt model was ludicrous and still is. Check out Dr. Paul Gatlin's studies and see that it is true that aerobic process contribute quickly and to a great degree. Even as far back as 1953, famous researcher, Margaria, said that at the 23 second mark of an all-out sprint oxidative processes contributed 50% to the total caloric requirements (at that moment) and as time passed the percentage grew larger and larger. In 1969, researcher Dr. Hermansen showed the the oxygen debt model was both wrong and just plain stupid for us to use.

I talked to Dr. Joe Vigil about this last weekend and he told me that he was not suprised at all. I told him the numbers from studies using updated lab methods and he acknowledged the information as both interesting and relevant. The following data has been revealed by Spencer, Gatline, Payne, Medbo, Thibualt, and Perronet, to name a few:

total energetics -

200m - 29% aerobic (at :22.3 for the 200m)
400m - 46% aerobic (at :49.3 for the 400m)
800m - 66% aerobic (at 1:53 for the 800m)
1500m - 84% aerobic (at 3:55 for the 1500m)

Guy Thiubault and Francois Perronet revealed their research in the British Journal of Sports Medicine in 1989 in which they has used isotope tracers to measure moment by moment energetics within cells. Their results showed that by the 60 second mark in a 90 second maximum speed test on collegiate runners, 83% of energy was derived aerobically and by 90 seconds it was 91%. Remember, this is not the average but what it was at those moments in time.


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