英語資源頻道為大家整理的雙語新聞閱讀:每天上午10:30喝咖啡時(shí)間,供大家閱讀參考。
Why 10.30am is the ideal time for a coffee: Our body clocks are most receptive to the effects of caffeine a few hours after waking
For many of us, it is the rocket fuel that gets us going first thing in the morning.
But one expert has argued that to get the maximum effect of caffeine, it's better to hold on a few hours - because coffee is most effective if consumed between 9.30am and 11.30am.
Steven Miller, a neuroscientist from the Uniformed Services University of the Health Sciences in Maryland, says it is best to drink coffee when the body’s levels of the hormonecortisol are low because caffeine interacts with the hormone.
He explained that people who drink coffee when their cortisol levels are high – namely, between 8am and 9am – develop a tolerance to caffeine, meaning it becomes less effective.
Cortisol controls the body clock and causes people to feel wide awake, The Telegraph reports.
The body’s levels of the hormone are usually high just after a person wakes up but start to fall about an hour afterwards.
Mr Miller argues that it is during this drop in cortisol levels that people get the most benefit from the caffeine in coffee – it gives them a boost as it encourages cortisol production when their cortisol levels start to drop and they do not become resistant to its benefits.
He explained that cortisol levels also peak at lunchtime and between 5.30pm and 6.30pm, meaning that these would also not be good times to drink coffee.
Writing on his blog he said: ‘If we are drinking caffeine at a time when your cortisol concentration in the blood is at its peak, you probably should not be drinking it.
‘This is because cortisol production is strongly related to your level of alertness and cortisol peaks for your 24 hour rhythm between 8 and 9am on average.
‘One of the key principles of pharmacology is use a drug when it is needed. Otherwise, we can develop tolerance to a drug administered at the same dose.’
He added that people who drink a coffee first thing in the morning, when their cortisol levels are naturally high, will soon find themselves needing to make their coffee stronger and stronger to get the desired effect.
However, he did accept that cortisol levels at different times of day vary from person to person meaning that the best time of day to drink a coffee also differs between people.
For example, people who get up very early may find their cortisol levels drop earlier than those of people who get up late.
The PhD student explained that cortisol levels in the body vary throughout the day.
He says it helps turn energy into sugar to be utilised by cells in the body and that it also plays a role in controlling the body clock.
很多人早晨起床第一件事就是喝一杯咖啡,解困去乏,補(bǔ)充動力。但專家稱,要想發(fā)揮咖啡因的作用,等到9:30到11:30再喝,因?yàn)檫@個(gè)時(shí)間段人體內(nèi)皮質(zhì)醇含量較低,喝咖啡效果。
美國健康科學(xué)統(tǒng)一服務(wù)大學(xué)(Uniformed Services University of the Health Sciences)神經(jīng)學(xué)教授史蒂文?米勒認(rèn)為,由于咖啡因會與荷爾蒙皮質(zhì)醇(hormonecortisol)發(fā)生反應(yīng),而早晨8點(diǎn)到9點(diǎn)之間,皮質(zhì)醇含量高,會對咖啡因產(chǎn)生抵抗,因此等體內(nèi)皮質(zhì)醇含量較低時(shí)喝咖啡。
皮質(zhì)醇控制人體的生物鐘,可以使人保持敏銳清醒。通常,人每天睡醒之后體內(nèi)荷爾蒙含量較高,一般一小時(shí)之后荷爾蒙含量開始下降。米勒教授表示,當(dāng)荷爾蒙皮質(zhì)醇含量下降時(shí),咖啡因開始發(fā)揮作用促進(jìn)皮質(zhì)醇產(chǎn)生,起到提神的作用。
另外,午餐時(shí)間和下午5:30到6:30之間,皮質(zhì)醇含量達(dá)到,這兩個(gè)時(shí)間段也不適宜喝咖啡。米勒教授說:“藥理學(xué)上有一條關(guān)鍵原則,就是要擇機(jī)施藥。時(shí)機(jī)不對只會適得其反?!痹谄べ|(zhì)醇含量高的時(shí)間段內(nèi)喝咖啡,需要越來越濃的咖啡才能起到理想的效果。
然而,米勒教授認(rèn)為,不同人在不同時(shí)間段體內(nèi)皮質(zhì)醇含量也不同,因此喝咖啡時(shí)間也可能因人而異。
Why 10.30am is the ideal time for a coffee: Our body clocks are most receptive to the effects of caffeine a few hours after waking
For many of us, it is the rocket fuel that gets us going first thing in the morning.
But one expert has argued that to get the maximum effect of caffeine, it's better to hold on a few hours - because coffee is most effective if consumed between 9.30am and 11.30am.
Steven Miller, a neuroscientist from the Uniformed Services University of the Health Sciences in Maryland, says it is best to drink coffee when the body’s levels of the hormonecortisol are low because caffeine interacts with the hormone.
He explained that people who drink coffee when their cortisol levels are high – namely, between 8am and 9am – develop a tolerance to caffeine, meaning it becomes less effective.
Cortisol controls the body clock and causes people to feel wide awake, The Telegraph reports.
The body’s levels of the hormone are usually high just after a person wakes up but start to fall about an hour afterwards.
Mr Miller argues that it is during this drop in cortisol levels that people get the most benefit from the caffeine in coffee – it gives them a boost as it encourages cortisol production when their cortisol levels start to drop and they do not become resistant to its benefits.
He explained that cortisol levels also peak at lunchtime and between 5.30pm and 6.30pm, meaning that these would also not be good times to drink coffee.
Writing on his blog he said: ‘If we are drinking caffeine at a time when your cortisol concentration in the blood is at its peak, you probably should not be drinking it.
‘This is because cortisol production is strongly related to your level of alertness and cortisol peaks for your 24 hour rhythm between 8 and 9am on average.
‘One of the key principles of pharmacology is use a drug when it is needed. Otherwise, we can develop tolerance to a drug administered at the same dose.’
He added that people who drink a coffee first thing in the morning, when their cortisol levels are naturally high, will soon find themselves needing to make their coffee stronger and stronger to get the desired effect.
However, he did accept that cortisol levels at different times of day vary from person to person meaning that the best time of day to drink a coffee also differs between people.
For example, people who get up very early may find their cortisol levels drop earlier than those of people who get up late.
The PhD student explained that cortisol levels in the body vary throughout the day.
He says it helps turn energy into sugar to be utilised by cells in the body and that it also plays a role in controlling the body clock.
很多人早晨起床第一件事就是喝一杯咖啡,解困去乏,補(bǔ)充動力。但專家稱,要想發(fā)揮咖啡因的作用,等到9:30到11:30再喝,因?yàn)檫@個(gè)時(shí)間段人體內(nèi)皮質(zhì)醇含量較低,喝咖啡效果。
美國健康科學(xué)統(tǒng)一服務(wù)大學(xué)(Uniformed Services University of the Health Sciences)神經(jīng)學(xué)教授史蒂文?米勒認(rèn)為,由于咖啡因會與荷爾蒙皮質(zhì)醇(hormonecortisol)發(fā)生反應(yīng),而早晨8點(diǎn)到9點(diǎn)之間,皮質(zhì)醇含量高,會對咖啡因產(chǎn)生抵抗,因此等體內(nèi)皮質(zhì)醇含量較低時(shí)喝咖啡。
皮質(zhì)醇控制人體的生物鐘,可以使人保持敏銳清醒。通常,人每天睡醒之后體內(nèi)荷爾蒙含量較高,一般一小時(shí)之后荷爾蒙含量開始下降。米勒教授表示,當(dāng)荷爾蒙皮質(zhì)醇含量下降時(shí),咖啡因開始發(fā)揮作用促進(jìn)皮質(zhì)醇產(chǎn)生,起到提神的作用。
另外,午餐時(shí)間和下午5:30到6:30之間,皮質(zhì)醇含量達(dá)到,這兩個(gè)時(shí)間段也不適宜喝咖啡。米勒教授說:“藥理學(xué)上有一條關(guān)鍵原則,就是要擇機(jī)施藥。時(shí)機(jī)不對只會適得其反?!痹谄べ|(zhì)醇含量高的時(shí)間段內(nèi)喝咖啡,需要越來越濃的咖啡才能起到理想的效果。
然而,米勒教授認(rèn)為,不同人在不同時(shí)間段體內(nèi)皮質(zhì)醇含量也不同,因此喝咖啡時(shí)間也可能因人而異。