SSS 2008-09-25
时间：2018-12-24 作者：英语课 分类：Scientific American(九)月
This is Scientific American's 60-Second Science. I'm Steve Mirsky . Got a minute ?
Athletes have obviously been tempted 1 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 Physiological 2 Society.
Swedish scientists looked at power lifters, a pure strength sport. Steroids can increase muscle fiber 3 size and the number of cell nuclei 4 in the fiber. The researchers found that even years after steroid withdrawal—and with little or no current strength training—muscle fiber density 5 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 .
- 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。
- 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。
- 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。