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SSS 2009-04-16

时间:2010-05-17 08:01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 Cynthia Graber. This will just take a minute.

Hard-training athletes boost their performance with a variety of popular sports drinks. These drinks do work. But not in the way you’d think. That’s according to research just published in The Journal of Physiology1.

Researchers tested three drinks. One contained glucose2, a sugar. A second had maltodextrin, a tasteless carbohydrate3. The third was plain water. All three were laced with artificial sweeteners until they tasted identically sweet.

Endurance athletes rinsed4 their mouths with one of the three drinks during a tough workout. Surprisingly, athletes that rinsed and spat5 out the glucose and maltodextrin performed 2 to 3 percent better than those who got the artificial sweetener. They said they didn’t feel like they were working any harder. Then they had their brains scanned by fMRI. The drinks that had real sugar and carbs lit up areas of the brain connected to pleasure and reward. But the fake sweet water did not.

So maybe experiencing pleasure helps override6 some of the challenge of the workout. And scientists say this means there are receptors in our mouth other than for simple taste, receptors that communicate directly with the brain. Kind of gives new meaning to the term muscle-head.

 

Thanks for the minute for Scientific American's 60-Second Science. I'm Cynthia Graber.

 


点击收听单词发音收听单词发音  

1 physiology uAfyL     
n.生理学,生理机能
参考例句:
  • He bought a book about physiology.他买了一本生理学方面的书。
  • He was awarded the Nobel Prize for achievements in physiology.他因生理学方面的建树而被授予诺贝尔奖。
2 glucose Fyiyz     
n.葡萄糖
参考例句:
  • I gave him an extra dose of glucose to pep him up.我给他多注射了一剂葡萄糖以增强他的活力。
  • The doctor injected glucose into his patient's veins.医生将葡萄糖注入病人的静脉。
3 carbohydrate FTPy0     
n.碳水化合物;糖类;(plural)淀粉质或糖类
参考例句:
  • You should not have too much carbohydrate in your diet.你日常饮食中不该有过多碳水化合物。
  • Cashew nuts are rich in carbohydrate.腰果含丰富碳水化合物。
4 rinsed 637d6ed17a5c20097c9dbfb69621fd20     
v.漂洗( rinse的过去式和过去分词 );冲洗;用清水漂洗掉(肥皂泡等);(用清水)冲掉
参考例句:
  • She rinsed out the sea water from her swimming-costume. 她把游泳衣里的海水冲洗掉。 来自《简明英汉词典》
  • The clothes have been rinsed three times. 衣服已经洗了三和。 来自《现代汉英综合大词典》
5 spat pFdzJ     
n.口角,掌击;v.发出呼噜呼噜声
参考例句:
  • Her parents always have spats.她的父母经常有些小的口角。
  • There is only a spat between the brother and sister.那只是兄妹间的小吵小闹。
6 override sK4xu     
vt.不顾,不理睬,否决;压倒,优先于
参考例句:
  • The welfare of a child should always override the wishes of its parents.孩子的幸福安康应该永远比父母的愿望来得更重要。
  • I'm applying in advance for the authority to override him.我提前申请当局对他进行否决。
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