《转贴：喝咖啡如何影响血压？》 ＃268
转贴文摘要： 梅奥诊所（Mayo Clinic）的 谢尔顿 G. Sheps 医学博士 解答：
咖啡因可短期显著的增加你的血压，甚至你没有高血压。目前还不清楚是什么原因导致这种尖峰血压变化。
注：Mayo Clinic ，Rochester，Minnesota。是U.S.news发布的 《2015年全美国最好医院》的第二名。
我译转贴文： ————————————————
《咖啡因如何影响血压？》
咖啡因可短期显著的增加你的血压，甚至你没有高血压。目前还不清楚是什么原因导致这种尖峰血压变化。一些研究人员认为，咖啡因可以阻止一种有助于保持你的动脉宽度的激素。其他人则认为，咖啡因会导致肾上腺释放更多的肾上腺素，从而导致血压上升。 有些经常喝含咖啡因的饮料的人比不喝的人有较高的平均血压。其他经常喝含咖啡因饮料的人则产生了对咖啡因的容忍性。其结果是，咖啡因没有对他们的血压有长期效果。看来，咖啡因具有较强的血压增加影响是对70岁以上，或是超重的男人。 如果你有高血压，询问医生是否应限制或停止饮用含咖啡因的饮料。如果你担心咖啡因对你的血压的作用，尽量限制喝咖啡因每天200毫克的数额 - 大约相同数量的煮咖啡两个12盎司（355-millileter）杯。请记住，咖啡及其他饮料中的咖啡因含量随品牌而异。此外，在那些自然会增加你的血压的活动前应避免咖啡因，如运动，举重或重体力劳动。 要查看是否咖啡因可能会提高你的血压，可在喝一杯咖啡（或含咖啡因的饮料）30～120分钟范围检查你的血压。如果你的血压增加了5到10，你可能是对咖啡因的血压升高效果敏感。如果你打算削减咖啡因，则在数天至一周逐步做到，以避免戒断头痛。
以下为转贴文： ————————————————————
How does caffeine affect blood pressure? Answers from Sheldon G. Sheps, M.D.
Caffeine can cause a short, but dramatic increase in your blood pressure, even if you don't have high blood pressure. It's unclear what causes this spike in blood pressure. Some researchers believe that caffeine could block a hormone that helps keep your arteries widened. Others think that caffeine causes your adrenal glands to release more adrenaline, which causes your blood pressure to increase. Some people who regularly drink caffeinated beverages have a higher average blood pressure than do those who drink none. Others who regularly drink caffeinated beverages develop a tolerance to caffeine. As a result, caffeine doesn't have a long–term effect on their blood pressure. It seems that caffeine has a stronger blood pressure increasing effect in men who are older than 70 or who are overweight. If you have high blood pressure, ask your doctor whether you should limit or stop drinking caffeinated beverages. If you're concerned about caffeine's effect on your blood pressure, try limiting the amount of caffeine you drink to 200 milligrams a day — about the same amount as in two 12–ounce (355–millileter) cups of brewed coffee. Keep in mind that the amount of caffeine in coffee and other beverages varies by brand. Also, avoid caffeine right before activities that naturally increase your blood pressure, such as exercise, weightlifting or hard physical labor. To see if caffeine might be raising your blood pressure, check your blood pressure within 30 to 120 minutes of drinking a cup of coffee or another caffeinated beverage. If your blood pressure increases by five to 10 points, you may be sensitive to the blood pressure raising effects of caffeine. If you plan to cut back on caffeine, do so gradually over several days to a week to avoid withdrawal headaches. With Sheldon G. Sheps, M.D.
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