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SSS 2008-09-25

时间:2010-05-15 01:28来源:互联网 提供网友:木渐浅。   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific American's 60-Second Science. I'm Steve Mirsky . Got a minute ?

 

Athletes have obviously been tempted1 to use performance enhancing anabolic steroids. Drug testing may discourage such use. But a new study finds that some of the performance benefits of steroid use may persist years after an athlete stops doping. That’s according to research presented this week at a conference of the American Physiological2 Society.

Swedish scientists looked at power lifters, a pure strength sport. Steroids can increase muscle fiber3 size and the number of cell nuclei4 in the fiber. The researchers found that even years after steroid withdrawal—and with little or no current strength training—muscle fiber density5 and increased number of cell nuclei were comparable to drug-free athletes currently doing high-intensity strength-training. The additional cell nuclei could give a big advantage to former dopers—more nuclei means more protein synthesis, which means more muscle. So steroid use can still offer a competitive advantage years later. Which means that a clean ballplayer can still hit a dirty home run.

 

Thanks for the minute for Scientific American's 60-Second Science. I'm Steve Mirsky .
 


点击收听单词发音收听单词发音  

1 tempted b0182e969d369add1b9ce2353d3c6ad6     
v.怂恿(某人)干不正当的事;冒…的险(tempt的过去分词)
参考例句:
  • I was sorely tempted to complain, but I didn't. 我极想发牢骚,但还是没开口。
  • I was tempted by the dessert menu. 甜食菜单馋得我垂涎欲滴。
2 physiological aAvyK     
adj.生理学的,生理学上的
参考例句:
  • He bought a physiological book.他买了一本生理学方面的书。
  • Every individual has a physiological requirement for each nutrient.每个人对每种营养成分都有一种生理上的需要。
3 fiber NzAye     
n.纤维,纤维质
参考例句:
  • The basic structural unit of yarn is the fiber.纤维是纱的基本结构单元。
  • The material must be free of fiber clumps.这种材料必须无纤维块。
4 nuclei tHCxF     
n.核
参考例句:
  • To free electrons, something has to make them whirl fast enough to break away from their nuclei. 为了释放电子,必须使电子高速旋转而足以摆脱原子核的束缚。
  • Energy is released by the fission of atomic nuclei. 能量是由原子核分裂释放出来的。
5 density rOdzZ     
n.密集,密度,浓度
参考例句:
  • The population density of that country is 685 per square mile.那个国家的人口密度为每平方英里685人。
  • The region has a very high population density.该地区的人口密度很高。
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TAG标签:   SSS  performance
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