2011年1月2日星期日

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More force equals more speed. It could be inferred that ablebodied sprinters, using a prosthesis on one leg, would likely run slower as a result of less force. A full breakdown of the study and a video of the tests appears in this Science Now article.The best quote in the Science Now article came from YoungHui Chang, a comparative physiologist at the Georgia Institute ofTechnology in Atlanta....the debate may be missinghow replica Gucci 23928 Ladie's watch much amputee athletes must overcome mechanically to competealongside ablebodied runners. These devices cant generate power ontheir own, like biological legs can, he says. To think that[prostheses] give you an unfair advantage may be overlooking theobvious.

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A couple of years ago, Wired magazine put out a forwardlooking article addressing whether paralympic sprinter Oscar Pistoriuss artificial legs (called Cheetahs) gave him an advantage over ablebodied sprinters. After all, at the time he was close to qualifying for the Olympics with prostheses. No one expects ablebodied runners to replica Gucci YA068540 6800 WoMen's watch compete headtohead withwheelchairbound marathoners. The wheels confer an obvious speedadvantage, and maybe Oscar Pistorius’ Cheetahs do, too. So the realquestion is this: Do ablebodied athletes need protection from him?

(Wired, March 2007)A team of scientists from MIT took on the challenge, testing whether new advances in prosthetic technology gave athletes with artificial legs an advantage. The team put six elite sprinters with prosthetic legs on a fancy treadmill. They measured the ground reaction force of the sprinters legs and watched videos to replica Gucci 26830 WoMen's watch examine leg swing times. The article was published this week in Biology Letters.Though prosthetic legs are lighter than real legs, the athletes equipped with them did not have faster swing times. In addition, the sprinters tested measured 9 percent less ground reaction force on their prosthesis.

2010年12月21日星期二

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