掰指关节并不会对关节有伤害
文章来源:未知 文章作者:enread 发布时间:2015-05-04 07:14 字体: [ ]  进入论坛
(单词翻译:双击或拖选)
It creates a sound that sets teeth on edge and, we're often told, raises the risk of arthritis1. But people who can crack their knuckles2 may actually have healthier joints4 than others. 

掰指关节的声音让人很不舒服,而且我们常被告知,掰指关节会增加患关节炎的风险。但实际上,那些“咔咔”地掰指关节的人比其他人拥有更健康的关节。
 
Scientists say that the force involved in making fingers 'pop' is more than enough to cause damage. 
 
Yet, studies show that regular knuckle3-cracking doesn't seem to do any harm. 
 
This suggests it is actually a sign of very healthy joints. 
 
The theory comes from Canadian researchers who used MRI scanners to peer deep inside the fingers and record just what happens when knuckles are cracked. 
 
One of the team, a 'gifted knuckle-cracker', put one finger at a time into a tube connected to a cable. 
 
This wire was then slowly pulled until the joint5 in large knuckle in the middle of each finger popped. 
 
After about six seconds pulling the cable, the two bones suddenly shot apart, creating a cavity, or bubble, within the fluid that bathes the inside of the joint. 
 
The cracking - which took less than a third of a second - occurred at the precise moment the bubble was formed, the journal PLOS ONE reports. 
 
Lead author Professor Greg Kawchuk, from the University of Alberta, said: 'We call it the "pull my finger study" - and actually pulled someone's finger and filmed what happens in the MRI. 
 
'When you do that, you can see very clearly what is happening inside the joints. 
 
'It is a bit like forming a vacuum. 
 
'As the joint surfaces suddenly separate, there is no more fluid available to fill the increasing joint volume, so a cavity is formed and that event is what is associated with the sound.' 
 
The scans also showed a mysterious white flash occurs just before the noise is heard. 
 
Further research is needed into this streak6 of light - and why the cracking sound is so loud. 
 
However, the researchers are happy to have shown that the noise is created when a bubble forms inside the knuckle. 
 
Although this was first suggested more than 100 years ago, recent thinking has been that the crack is created when a bubble bursts. 
 
Previous studies have shown that between 25 and 54 per cent of us crack our knuckles - with men doing it more than women. 
 
And despite the common wisdom that the habit raises the risk of arthritis, previous studies have failed to prove this. 
 
One comparison of Los Angeles nursing home residents found those who had regularly cracked their knuckles were actually less likely to have damaged joints. 
 
The US researchers behind that study concluded: 'The chief morbid7 consequence of knuckle cracking would appear to be its annoying effect on the observer.'


点击收听单词发音收听单词发音  

1 arthritis XeyyE     
n.关节炎
参考例句:
  • Rheumatoid arthritis has also been linked with the virus.风湿性关节炎也与这种病毒有关。
  • He spent three months in the hospital with acute rheumatic arthritis.他患急性风湿性关节炎,在医院住了三个月。
2 knuckles c726698620762d88f738be4a294fae79     
n.(指人)指关节( knuckle的名词复数 );(指动物)膝关节,踝v.(指人)指关节( knuckle的第三人称单数 );(指动物)膝关节,踝
参考例句:
  • He gripped the wheel until his knuckles whitened. 他紧紧握住方向盘,握得指关节都变白了。
  • Her thin hands were twisted by swollen knuckles. 她那双纤手因肿大的指关节而变了形。 来自《简明英汉词典》
3 knuckle r9Qzw     
n.指节;vi.开始努力工作;屈服,认输
参考例句:
  • They refused to knuckle under to any pressure.他们拒不屈从任何压力。
  • You'll really have to knuckle down if you want to pass the examination.如果想通过考试,你确实应专心学习。
4 joints d97dcffd67eca7255ca514e4084b746e     
接头( joint的名词复数 ); 关节; 公共场所(尤指价格低廉的饮食和娱乐场所) (非正式); 一块烤肉 (英式英语)
参考例句:
  • Expansion joints of various kinds are fitted on gas mains. 各种各样的伸缩接头被安装在煤气的总管道上了。
  • Expansion joints of various kinds are fitted on steam pipes. 各种各样的伸缩接头被安装在蒸气管道上了。
5 joint m3lx4     
adj.联合的,共同的;n.关节,接合处;v.连接,贴合
参考例句:
  • I had a bad fall,which put my shoulder out of joint.我重重地摔了一跤,肩膀脫臼了。
  • We wrote a letter in joint names.我们联名写了封信。
6 streak UGgzL     
n.条理,斑纹,倾向,少许,痕迹;v.加条纹,变成条纹,奔驰,快速移动
参考例句:
  • The Indians used to streak their faces with paint.印第安人过去常用颜料在脸上涂条纹。
  • Why did you streak the tree?你为什么在树上刻条纹?
7 morbid u6qz3     
adj.病的;致病的;病态的;可怕的
参考例句:
  • Some people have a morbid fascination with crime.一些人对犯罪有一种病态的痴迷。
  • It's morbid to dwell on cemeteries and such like.不厌其烦地谈论墓地以及诸如此类的事是一种病态。
TAG标签: knuckle joints cracking
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