打哈欠有益健康
[p=30, 2, left][b][font=宋体][size=10.5pt][color=#000000]普林斯顿最新研究:打哈欠有益健康[/color][/size][/font][/b][/p][p=30, 2, left][url=http://u.kekenet.com/uploadfile/Read/UploadFiles_9483/201110/2011101309331880.jpg][color=#004276][color=#000000][/color][/color][/url][/p][p=30, 2, left] We most [url=http://kkdict.com/en/associate][b][color=#004276]associate[/color][/b][/url] yawning with [url=http://kkdict.com/en/boredom][b][color=#004276]boredom[/color][/b][/url] or being sleepy, but new research suggests it can be good for your health—by cooling down your brain.[font=宋体][size=12pt][/size][/font][/p][p=30, 2, left] Scientists at Princeton University found a big yawn can [url=http://kkdict.com/en/regulate][b][color=#004276]regulate[/color][/b][/url] the [url=http://kkdict.com/en/temperature][b][color=#004276]temperature[/color][/b][/url] of the brain and [url=http://kkdict.com/en/prevent][b][color=#004276]prevent[/color][/b][/url] over-heating.[/p][p=30, 2, left] During winter, Professor Andrew Gallup and his team asked 80 [url=http://kkdict.com/en/random][b][color=#004276]random[/color][/b][/url] pedestrians to look at images of people yawning and then recorded whether they yawned in [url=http://kkdict.com/en/response][b][color=#004276]response[/color][/b][/url]. They then performed the same [url=http://kkdict.com/en/trial][b][color=#004276]trial[/color][/b][/url] in the summer.[/p][p=30, 2, left] The researchers found that half of the participants yawned in winter while only a quarter yawned in summer. You may think people would [url=http://kkdict.com/en/tend][b][color=#004276]tend[/color][/b][/url] to cool the brain by yawning more in summer. But according to the theory, yawning cools the brain via a heat [url=http://kkdict.com/en/exchange][b][color=#004276]exchange[/color][/b][/url] with cooler air. This system therefore wouldn't work on a scorching summer's day.[/p][p=30, 2, left] Professor Gallup said: "Yawning should be [url=http://kkdict.com/en/suppressed][b][color=#004276]suppressed[/color][/b][/url]—in ambient temperatures exceeding body [url=http://kkdict.com/en/temperature][b][color=#004276]temperature[/color][/b][/url] because taking a deep [url=http://kkdict.com/en/inhalation][b][color=#004276]inhalation[/color][/b][/url] of air would not [url=http://kkdict.com/en/promote][b][color=#004276]promote[/color][/b][/url] cooling.[/p][p=30, 2, left] He also suggested that this is the first study to show that yawning [url=http://kkdict.com/en/frequency][b][color=#004276]frequency[/color][/b][/url] varies from season to season. It could help explain why humans become [url=http://kkdict.com/en/confused][b][color=#004276]confused[/color][/b][/url] and disorientated in [url=http://kkdict.com/en/extreme][b][color=#004276]extreme[/color][/b][/url] heat as the brain has [url=http://kkdict.com/en/limited][b][color=#004276]limited[/color][/b][/url] ways of cooling itself down.[/p][p=30, 2, left] The research is published in the journal Frontiers in [url=http://kkdict.com/en/Evolutionary][b][color=#004276]Evolutionary[/color][/b][/url] Neuroscience.[/p][p=30, 2, left][font=宋体][size=10.5pt]据英国《每日邮报》[/size][/font]9[font=宋体][size=10.5pt]月[/size][/font]20[font=宋体][size=10.5pt]日报道，人们把多把打哈欠和无聊与瞌睡联系在一起，但一项新研究表明，打哈欠可以给人脑[/size][/font]“[font=宋体][size=10.5pt]降温[/size][/font]”[font=宋体][size=10.5pt]，有益健康。[/size][/font][/p][p=30, 2, left]
[font=宋体][size=10.5pt]普林斯顿大学的科学家发现，打一个大大哈欠可以调节人脑温度，避免人脑过热。[/size][/font][/p][p=30, 2, left]
[font=宋体][size=10.5pt]安德鲁[/size][/font]•[font=宋体][size=10.5pt]盖洛普教授和他的团队在冬天随机测试了[/size][/font]80[font=宋体][size=10.5pt]名路人，让他们看关于人们打哈欠的图像，记录他们是否以打哈欠回应，他们在夏天也做了相同的试验。[/size][/font][/p][p=30, 2, left]
[font=宋体][size=10.5pt]研究人员发现，在冬天，一半参与者都会打哈欠，而在夏天打哈欠的受试者只有[/size][/font]25%[font=宋体][size=10.5pt]。也许人们会认为，人在夏天时更倾向于给脑子降温，但是，根据该理论，打哈欠得通过和较冷的空气进行热传导才能降低人脑温度。因此，该系统无法在闷热的夏天发挥作用。[/size][/font][/p][p=30, 2, left]
[font=宋体][size=10.5pt]盖洛普教授说：[/size][/font]“[font=宋体][size=10.5pt]当周围温度超过人体温度时，深吸空气并不能帮助降温，打哈欠也就会受到抑制。[/size][/font]”[/p][p=30, 2, left]
[font=宋体][size=10.5pt]他还表示，该研究首次表明，打哈欠的频率会根据季节而变化，这能够帮助人们解释人脑降温途径受限时，会变得困惑和茫然的原因。[/size][/font][/p][p=30, 2, left]
[font=宋体][size=10.5pt]该研究发表在《进化神经系统前沿》杂志上。[/size][/font][/p][p=30, 2, left][font=Calibri][color=#000000] [/color][/font][/p]
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