| 查看: 722 | 回复: 5 | |||
cwnboy2008金虫 (小有名气)
|
[交流]
吃雪糕为什么会头痛
|
 We Finally Know What Really Causes Ice Cream Headaches Everyone's experienced that sharp, shooting headache as a result of stuffing their face with ice cream. Previously, scientists have suggested it's just a result of the rapid cooling and rewarming of blood vessels in the sinuses—but a new study shows that the cause is actually buried much deeper. The research, carried out in part by Harvard Medical School, used trans-cranial Doppler imaging to study blood flow in the brains of patients while they had ice cream headaches—sometimes referred to as brain freeze—induced using iced water. They also performed the experiment with normal water as a control. The results, which are being presented at the Experimental Biology 2012 conference, show that brain freeze is accompanied by a rapid dilation of the anterior cerebral artery, which floods the brain with blood and in turn causes pain. When the vessel constricts, patients report that the pain disappears. The researchers speculate that it's a form of self-defense for the brain: "The brain is one of the relatively important organs in the body, and it needs to be working all the time,... It's fairly sensitive to temperature, so vasodilation might be moving warm blood inside tissue to make sure the brain stays warm." They also explain that, because the skull is rigid, an increase in blood volume in the brain causes an increase in pressure, which is what induces the pain. While it's neat to get a better understanding of what causes those nasty ice cream headaches, the findings could prove far more useful than that. The researchers point out that similar blood flow alterations could be behind migraines and other types of headaches. If that's the case, targeting headaches with drugs that can specifically affect dilation of blood vessels could bring a lot of relief to an awful lot of people. from: http://gizmodo.com/5904298/we-fi ... ice-cream-headaches http://en.wikipedia.org/wiki/Ice-cream_headache http://www.mayoclinic.com/health/ice-cream-headaches/DS00640 http://zh.wikipedia.org/wiki/%E5 ... C%E5%A4%B4%E7%97%9B |
回复此楼» 猜你喜欢
欢迎发来filecode的Mz6后的代码验证其规律
已经有74人回复
-
岩土工程学报什么时候才能终审完呐
已经有4人回复
-
时间戳又变了8-15
已经有25人回复
-
2027广东省杰青
已经有6人回复
-
快农历七夕节了，轻松一下，男人悄悄话，女施主请不要进来。
已经有3人回复
-
哪位老哥知道今年的国自然具体哪一天放榜？
已经有9人回复
-
咱们一起用铁证分析2026国家社科基金中标与否
已经有26人回复
-
我的国基提前知道中了，可是同事的操作让我实在接受不了，怎么会有这样的人
已经有16人回复
-
有时候，自然基金真的不能太认真 （我的申报经验）
已经有12人回复
-
招聘 金属平磨液，抛光液研发工程师
已经有3人回复
scu2020
荣誉版主 (知名作家)
努力努力
-
专家经验: +52 - 健康EPI: 1
- 应助: 348 (大学生)
- 贵宾: 2.388
- 金币: 15347.9
- 散金: 16554
- 红花: 174
- 沙发: 37
- 帖子: 6225
- 在线: 649.3小时
- 虫号: 1955323
- 注册: 2012-08-25
- 性别: GG
- 专业: 传递过程
- 管辖: 工艺技术
2楼2013-07-27 12:15:52
| 、 |
3楼2013-07-27 12:17:08
cwnboy2008
金虫 (小有名气)
- 应助: 1 (幼儿园)
- 金币: 1226.5
- 散金: 154
- 红花: 1
- 帖子: 74
- 在线: 28.6小时
- 虫号: 664781
- 注册: 2008-11-30
- 性别: GG
- 专业: 黏膜免疫学
4楼2013-07-27 22:22:44
烟涛微茫
铁杆木虫 (文坛精英)
卡牌大师
- 应助: 56 (初中生)
- 金币: 7695.5
- 散金: 2662
- 红花: 95
- 沙发: 465
- 帖子: 17285
- 在线: 1303.2小时
- 虫号: 1935281
- 注册: 2012-08-12
- 性别: GG
- 专业: 生物大分子结构与功能
看到了 
5楼2013-07-27 22:48:57
|
感谢分享！ [ 发自手机版 http://muchong.com/3g ] |
6楼2013-07-30 01:27:14
25
