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Labi1995 Offline



Beiträge: 436

28.08.2019 07:28
I may not be an expert Antworten

If there is one thing that I have learned in 15+ years of teaching and studying biology, it’s that variation is the norm rather than the exception. Variability is the reason why biology is sometimes called the “sloppy science,” and it’s the reason why undergraduate biology majors at my college are required to take a course in Nike Air Max Thea Femme statistics. Statistical methods are the tools that we use to tease out pattern from often Nike Air Max 270 Dames messy piles of data, and they allow us to come to not always very clear-cut conclusions. The upshot of this is that in any sample of data there is going to be variation, and there are going to be outliers who don’t follow the statistically supported pattern.As an anatomist, variation is inherent in nearly everything that I teach and study, from the frogs that I wrote my dissertation on, to the cats, pigs, and sharks that my students dissect in the laboratory. Variation is the bane of my student’s existence in the anatomy lab, and it often comes as a surprise when I tell them that the exact pattern of branching blood vessels in one cat may not be exactly the same as that in the cat on the next bench over. Some cats are muscular brawlers, Nike Air Max 90 Mujer whereas others have muscles so wispy that it’s a wonder that they could support their own body weight. www.marmarisco.esAnyone who has taken human gross anatomy in medical school has probably observed the exact same thing in the human cadavers that they dissected. Variation is normal. In fact, it’s essential – variation serves as the raw material upon which natural selection can act in the process of evolution, and it’s ultimately the reason why we can now run down the road on two legs instead of four.So what does this discussion of variation have to do with running? I’ve been thinking a lot about running form lately, and have gone so far as to start experimenting with my own stride. It is therefore with a great deal of interest that I read the following quote by Alberto Salazar: “There has to be one best way of running. It’s got to be like a law www.aadkruiswijk.nl of physics. And if you deviate too much from that–the way I did in my career–it can be a big handicap.” Nike Air Max 90 Mens From a purely biomechanical perspective, I tend to agree that there is probably an optimal way for a human to run, but the biologist in me keeps coming back to the topic of variation. Humans are highly variable animals, probably much more-so now than when we were developing our distance running skills millions of years ago out on the African savannah. Take one glance at any gathering of humans and you will see short people and tall people, thin people and heavy people. You will see some with biomechanical abnormalities. If you could look beneath the skin, you’d also find variation in bone structure and muscle composition, as well as innumerable other anatomical and physiological differences. Getting back to Salazar, variation is why they had to develop a shoe insert for Dathan Ritzenhein’s unique metatarsal structure. Given this,Nike Air Max 90 Womens I find it unlikely that there is a single “perfect” running form that will equally apply to every single human being who runs. I may not be an expert on running mechanics (not even close!), but I know a thing or two about variation, and the realist in me says that what works for a sub-5:00 miler may not work for those of us who run our miles at an average pace of 8:00 per mile or higher. Variation in all of its forms needs to be taken into account when talking about things like an ideal running form.My goal in this post is to address the topic of variation in running form as it applies to a small sample of elite runners. This past April two of my students went down to Boston and filmed the first 1000 or so runners to pass the ~17.5 mile mark in Newton during the Boston Marathon (on Washington St. near the intersection with Commonwealth Nike Internationalist Donne Ave. – see picture at right from Google Street View – it was a relatively flat stretch of the course). The film was recorded in slow motion at 300 frames/second (see below), which allows a high degree of accuracy and detail when examining aspects of the running stride.

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