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Running article with lots of applicability to x-c skiing
http://www.mastersathletics.info/ind...ing&Itemid=129
The first thing that came to mind while reading it was how we were taught about "kicking back" years ago (some still teach it), but the article goes well beyond that to the physics and biomechanics of how we move and where speed comes from - and the illusion of video. Gene |
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Running article with lots of applicability to x-c skiing
On Fri, 11 Feb 2011 07:40:47 +0100
Terje Mathisen "terje.mathisen at tmsw.no" wrote: wrote: http://www.mastersathletics.info/ind...ing&Itemid=129 Very interesting, but wrong in at least one aspect: They imply very strongly that a body moving (parallel to the ground!) at higher speed will strike the ground with more force than a slower one. Physics is not my field. As I read the article - and I've copied two relevant passages below - it would seem its key claim is that greater speed largely comes from greater isometric force support against the ground, leading to more stored elastic energy released with each push off. It looks to me like the word "support" is key to the point. That is, is the writer actually saying that faster runners strike with more force, or that the same force against the ground has different results depending on the runner's plyometric strength (and conditioning)? It's not real clearly written in that regard. "Faster runners have “quick feet” because they create more elastic energy and have greater mass-specific force support against the ground. Mass-specific force is the amount of isometric force applied to the ground to offset the effects of gravity. Greater amounts of mass-specific force = shorter ground contact time = faster running." "The speed of the athlete is dictated to a large extent by the amount of stored elastic energy that is released." Gene |
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