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We all know that a good workout helps us relax. Now scientists have worked out why.
It seems that well-honed muscles stop a stress chemical from reaching the brain.
The muscles filter out the dangerous substance, much like the liver removes poisons from the body.
The finding doesn’t just help explain why exercising makes us feel less stressed – it could also lead to new treatments for depression.
The Swedish researchers put two group of mice under stress by exposing them to loud bangs and flashing lights and waking them up at odd times.
After five weeks of this, the normal mice showed signs of depression, including loss of appetite.
However, the second group of GM mice remained healthy.
These mice had genes that meant they were muscly, even without exercising.
Further tests showed what is magical about muscle.
Muscly mice make more of protective proteins called KATs. These stop a stress chemical called kynurenine from travelling to the brain.
The researchers from Stockholm’s Karolinska Institute showed that normal mice quickly become depressed when given kynurenine.
But muscly mice were immune to the chemical.
In fact, the amount of kynurenine in their blood never rose because the KAT enzymes in their bulging muscles quickly neutralised it.
Other experiments showed that normal mice made more of the protective KATs after regularly running on their wheel.
Importantly, people also made more KATs after just a few weeks of exercise.
Researcher Jorge Ruas said that by detoxifying the blood, muscle protects the brain said: ‘Well-trained muscle produces an enzyme that purges the body of harmful substances.
‘The muscle’s function is reminiscent of the kidney or liver.’
Writing in the journal Cell, Dr Ruas said the discovery paves the way for new and better treatments for depression, which affects up to one in five Britons as some point in their life.
Drugs that that works on the muscles, rather than the brain, should produce fewer side-effects.
Dr Ruas said: ‘Depression is a debilitating condition with a profound impact on quality of life for millions of people worldwide.
‘Depression is one the world’s leading causes of disease burden and time lived with disability and current anti-depressant treatments are insufficient.
‘Our work suggests that there is great therapeutic potential…in harnessing one of the many beneficial effects of exercise.’
參考譯文：
合理的體育鍛煉可以幫助我們放松心情，這一點(diǎn)眾所周知，但是其原理卻不明確。最近，來(lái)自瑞典的科學(xué)家給出了答案：精心訓(xùn)練的肌肉似乎可以象肝臟清除體內(nèi)毒物一樣，濾掉造成壓力的化學(xué)物質(zhì)，阻止它們到達(dá)大腦而起作用。
這一發(fā)現(xiàn)并不僅僅有助于解釋為什么運(yùn)動(dòng)可以減輕壓力，也可能導(dǎo)致開(kāi)發(fā)出抑郁癥的新療法。
來(lái)自瑞典斯德哥爾摩卡羅林斯卡醫(yī)學(xué)院研究人員把兩組小鼠暴露在巨響和燈光閃爍的環(huán)境中，并剝奪它們的睡眠時(shí)間，導(dǎo)致它們處于壓力狀態(tài)。
5周后，正常的小鼠表現(xiàn)出抑郁癥跡象，包括食欲不振。但是轉(zhuǎn)基因組小鼠卻保持了健康狀態(tài)，這組小鼠通過(guò)了基因修飾，幫助它們即使不運(yùn)動(dòng)也能保持強(qiáng)健發(fā)達(dá)的肌肉。
進(jìn)一步的實(shí)驗(yàn)揭開(kāi)了其中奧秘：原來(lái)強(qiáng)健的肌肉可以產(chǎn)生更多被稱為KATS的保護(hù)性蛋白，這種酶可以分解清除血液中的被稱為犬尿氨酸的應(yīng)激化學(xué)物質(zhì)，組織它們進(jìn)入大腦而導(dǎo)致抑郁癥狀。
當(dāng)研究人員給予犬尿氨酸，正常的小鼠很快變得沮喪，證明這種化學(xué)物質(zhì)的確可以導(dǎo)致抑郁癥狀發(fā)生。
但是，肌肉發(fā)達(dá)的小鼠卻對(duì)該化學(xué)物質(zhì)不敏感。研究人員發(fā)現(xiàn)，事實(shí)上，肌肉發(fā)達(dá)的小鼠血液犬尿氨酸含量一直沒(méi)有升高，原因是肌肉產(chǎn)生的KATS酶可以迅速分解破壞犬尿氨酸。
另外的實(shí)驗(yàn)表明，正常小鼠通過(guò)規(guī)律性踏車運(yùn)動(dòng)可以產(chǎn)生更多保護(hù)性KATS。
重要的是，人只需要幾個(gè)星期鍛煉便可以產(chǎn)生大量KATS。
這項(xiàng)研究表明，肌肉可以具有類似肝臟和腎臟一樣的神奇的解毒功能，訓(xùn)練有素的肌肉通過(guò)產(chǎn)生保護(hù)性酶來(lái)清除血液中應(yīng)激性化學(xué)物質(zhì)起到保護(hù)大腦的作用。
研究人員進(jìn)一步解釋說(shuō)，這一發(fā)現(xiàn)除了從原理上證實(shí)運(yùn)動(dòng)可以幫助人們緩解壓力，還可能會(huì)導(dǎo)致抗抑郁癥新療法的產(chǎn)生。
這項(xiàng)研究最新發(fā)表在《細(xì)胞》雜志上。
原始來(lái)源：http://www.dailymail.co.uk/health/article-2769669/Feeling-anxious-Take-weights-class-Toned-muscles-block-stress-chemicals-reaching-brain.html
It seems that well-honed muscles stop a stress chemical from reaching the brain.
The muscles filter out the dangerous substance, much like the liver removes poisons from the body.
The finding doesn’t just help explain why exercising makes us feel less stressed – it could also lead to new treatments for depression.
The Swedish researchers put two group of mice under stress by exposing them to loud bangs and flashing lights and waking them up at odd times.
After five weeks of this, the normal mice showed signs of depression, including loss of appetite.
However, the second group of GM mice remained healthy.
These mice had genes that meant they were muscly, even without exercising.
Further tests showed what is magical about muscle.
Muscly mice make more of protective proteins called KATs. These stop a stress chemical called kynurenine from travelling to the brain.
The researchers from Stockholm’s Karolinska Institute showed that normal mice quickly become depressed when given kynurenine.
But muscly mice were immune to the chemical.
In fact, the amount of kynurenine in their blood never rose because the KAT enzymes in their bulging muscles quickly neutralised it.
Other experiments showed that normal mice made more of the protective KATs after regularly running on their wheel.
Importantly, people also made more KATs after just a few weeks of exercise.
Researcher Jorge Ruas said that by detoxifying the blood, muscle protects the brain said: ‘Well-trained muscle produces an enzyme that purges the body of harmful substances.
‘The muscle’s function is reminiscent of the kidney or liver.’
Writing in the journal Cell, Dr Ruas said the discovery paves the way for new and better treatments for depression, which affects up to one in five Britons as some point in their life.
Drugs that that works on the muscles, rather than the brain, should produce fewer side-effects.
Dr Ruas said: ‘Depression is a debilitating condition with a profound impact on quality of life for millions of people worldwide.
‘Depression is one the world’s leading causes of disease burden and time lived with disability and current anti-depressant treatments are insufficient.
‘Our work suggests that there is great therapeutic potential…in harnessing one of the many beneficial effects of exercise.’
參考譯文：
合理的體育鍛煉可以幫助我們放松心情，這一點(diǎn)眾所周知，但是其原理卻不明確。最近，來(lái)自瑞典的科學(xué)家給出了答案：精心訓(xùn)練的肌肉似乎可以象肝臟清除體內(nèi)毒物一樣，濾掉造成壓力的化學(xué)物質(zhì)，阻止它們到達(dá)大腦而起作用。
這一發(fā)現(xiàn)并不僅僅有助于解釋為什么運(yùn)動(dòng)可以減輕壓力，也可能導(dǎo)致開(kāi)發(fā)出抑郁癥的新療法。
來(lái)自瑞典斯德哥爾摩卡羅林斯卡醫(yī)學(xué)院研究人員把兩組小鼠暴露在巨響和燈光閃爍的環(huán)境中，并剝奪它們的睡眠時(shí)間，導(dǎo)致它們處于壓力狀態(tài)。
5周后，正常的小鼠表現(xiàn)出抑郁癥跡象，包括食欲不振。但是轉(zhuǎn)基因組小鼠卻保持了健康狀態(tài)，這組小鼠通過(guò)了基因修飾，幫助它們即使不運(yùn)動(dòng)也能保持強(qiáng)健發(fā)達(dá)的肌肉。
進(jìn)一步的實(shí)驗(yàn)揭開(kāi)了其中奧秘：原來(lái)強(qiáng)健的肌肉可以產(chǎn)生更多被稱為KATS的保護(hù)性蛋白，這種酶可以分解清除血液中的被稱為犬尿氨酸的應(yīng)激化學(xué)物質(zhì)，組織它們進(jìn)入大腦而導(dǎo)致抑郁癥狀。
當(dāng)研究人員給予犬尿氨酸，正常的小鼠很快變得沮喪，證明這種化學(xué)物質(zhì)的確可以導(dǎo)致抑郁癥狀發(fā)生。
但是，肌肉發(fā)達(dá)的小鼠卻對(duì)該化學(xué)物質(zhì)不敏感。研究人員發(fā)現(xiàn)，事實(shí)上，肌肉發(fā)達(dá)的小鼠血液犬尿氨酸含量一直沒(méi)有升高，原因是肌肉產(chǎn)生的KATS酶可以迅速分解破壞犬尿氨酸。
另外的實(shí)驗(yàn)表明，正常小鼠通過(guò)規(guī)律性踏車運(yùn)動(dòng)可以產(chǎn)生更多保護(hù)性KATS。
重要的是，人只需要幾個(gè)星期鍛煉便可以產(chǎn)生大量KATS。
這項(xiàng)研究表明，肌肉可以具有類似肝臟和腎臟一樣的神奇的解毒功能，訓(xùn)練有素的肌肉通過(guò)產(chǎn)生保護(hù)性酶來(lái)清除血液中應(yīng)激性化學(xué)物質(zhì)起到保護(hù)大腦的作用。
研究人員進(jìn)一步解釋說(shuō)，這一發(fā)現(xiàn)除了從原理上證實(shí)運(yùn)動(dòng)可以幫助人們緩解壓力，還可能會(huì)導(dǎo)致抗抑郁癥新療法的產(chǎn)生。
這項(xiàng)研究最新發(fā)表在《細(xì)胞》雜志上。
原始來(lái)源：http://www.dailymail.co.uk/health/article-2769669/Feeling-anxious-Take-weights-class-Toned-muscles-block-stress-chemicals-reaching-brain.html
