《轉貼：喝咖啡如何影響血壓？》

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轉貼文摘要：

梅奧診所（Mayo Clinic）的

謝爾頓 G. Sheps 醫學博士 解答：

咖啡因可短期顯著的增加你的血壓，甚至你沒有高血壓。目前還不清楚是什麼原因導致這種尖峰血壓變化。

註：Mayo Clinic ，Rochester，Minnesota。是U.S.news發布的 《2015年全美國最好醫院》的第二名。

我譯轉貼文：

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《咖啡因如何影響血壓？》

咖啡因可短期顯著的增加你的血壓，甚至你沒有高血壓。目前還不清楚是什麼原因導致這種尖峰血壓變化。一些研究人員認為，咖啡因可以阻止一種有助於保持你的動脈寬度的激素。其他人則認為，咖啡因會導致腎上腺釋放更多的腎上腺素，從而導致血壓上升。

有些經常喝含咖啡因的飲料的人比不喝的人有較高的平均血壓。其他經常喝含咖啡因飲料的人則產生了對咖啡因的容忍性。其結果是，咖啡因沒有對他們的血壓有長期效果。看來，咖啡因具有較強的血壓增加影響是對70歲以上，或是超重的男人。

如果你有高血壓，詢問醫生是否應限制或停止飲用含咖啡因的飲料。如果你擔心咖啡因對你的血壓的作用，儘量限制喝咖啡因每天200毫克的數額 - 大約相同數量的煮咖啡兩個12盎司（355-millileter）杯。請記住，咖啡及其他飲料中的咖啡因含量隨品牌而異。此外，在那些自然會增加你的血壓的活動前應避免咖啡因，如運動，舉重或重體力勞動。

要查看是否咖啡因可能會提高你的血壓，可在喝一杯咖啡（或含咖啡因的飲料）30～120分鐘範圍檢查你的血壓。如果你的血壓增加了5到10，你可能是對咖啡因的血壓升高效果敏感。如果你打算削減咖啡因，則在數天至一周逐步做到，以避免戒斷頭痛。

以下為轉貼文：

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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.

http://www.mayoclinic.org/diseases-conditions/high-blood-pressure/expert-answers/blood-pressure/faq-20058543

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轉貼文完。

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