Originally Posted by CTKook
What is odd here is that what Troy Flanagan says is based on the scientific research.
Yes. Perhaps I'll pass on to him hbear's admonition to read the actual research rather than just spout off. Before he headed to the NBA he was the High Performance Director of USSA here in Park City, responsible for athlete development at the elite level. Mind you, he does have a PhD (as do I, as well as a MD) and more than 20 years of experience so he would probably appreciate any help hbear can offer. I know I do.
Troy has made the following statement: "Several studies have shown that in a two-minute, all-out exhaustive exercise bout, over half the ATP energy produced in the muscles is done by the aerobic system." Is this true, or has he neglected the importance of the diagram hbear has copied from a website and posted several times? (And which, incidentally, doesn't show what hbear thinks it does.)
Spencer and Gastin (Med Sci Sports Exerc, 2001, 33 157-62) studied twenty highly trained athletes over 200-, 400-, 800- and 1500m distances. They found that the cross-over to predominantly aerobic energy systems occurred between 15 and 30 seconds after the start for the 400-, 800- and 1500m events. The percentage of total energy production derived from aerobic sources reflected this for each distance. So, unless a ski race is akin to a 200m sprint, cross-over does occur in a time frame that makes Flanagan's statement true.
I've been watching some Olympic kayaking on TV. A mid distance race is not unlike a GS in duration and the guys really do want to win medals, so they try very hard! Zouhal et al (J Strength & Condn Res, 2012, 26, 825-31) again found that cross-over to aerobic system dominance happened at about 30 seconds and that, by one minute, the aerobic system was responsible for the vast majority of energy production.
Let's look at other events of comparable duration. How about swimming? Figueredo et al had the same idea (Eur J Appl Physiol 2011, 111, 767-77) and found that even for the 200m, aerobic systems dominated after the first length, although anaerobic systems made a substantial contribution as swimmers "kicked" in the final stage.
An oldie but a goodie from the world of alpine ski racing. Tesch et al (Med Sci Sports Exerc, 1978, 10 85-90) - similar results with an interesting comment that "The results suggest more pronounced involvement of aerobic energy metabolism in skilled than in unskilled skiers." An observation that any good coach of elite skiers has made empirically. See also Tesch (Med Sci Sports Exerc, 1995, 27, 310-14): "The giant slalom probably calls for the largest reliance upon aerobic energy metabolism and oxygen uptake may increase to 75% - 100% of maximal aerobic power.
Perhaps Flanagan isn't a complete buffoon after all.
Anyway, I leave for Chile tomorrow. So no more from me for a while which should be a great relief to all!