一个关于心脏的提醒是对的，心脏不是那么健康的人群应该避免剧烈运动。所以也不需要咖啡来当兴奋剂来喝。
正好在这个话题上，就多补充一句，为了保护剧烈运动时的心脏，运动前要补充抗氧化剂，如Vc，橙汁之类的，原因是运动时人体会释放很多有毒物质到血液里，流经心脏是会造成伤害，据说这是运动诱发心脏病的原因之一。抗氧化剂能帮助减少血液里有毒物质浓度。
然后这文章就整一个掉书袋了。也有很大欺骗性。文章题目是说说咖啡的危害性，其实说的是过量咖啡的危害性。说一杯是安全剂量，没啥科学根据。
不过一杯咖啡--其实半杯就能了--足以消除运动时前十五，二十分钟给人体带来的不适感。以后人体自己会生产Dopamine，让人有飘飘欲仙的感觉，有点像吃了coccaine。这个是有人运动上瘾的原因。
因为这口水是咖啡引起的，那就也得说说咖啡的好处来更全面的了解下咖啡。不过像很多食品的研究，没最终的结论。可是最近的研究都比较正面，有代表性的是这篇2006年的harvard报告：
Coffee Health Risks: For the moderate drinker, coffee is safe says Harvard Women’s Health Watch
Despite 20 years of reassuring research, many people still avoid caffeinated coffee because they worry about its health effects. However, current research reveals that in moderation—a few cups a day—coffee is a safe beverage that may even offer some health benefits. The September issue of Harvard Women’s Health Watch weighs the pros and cons of this popular beverage and eases the concerns of moderate coffee drinkers. The latest research has not only confirmed that moderate coffee consumption doesn’t cause harm, it’s also uncovered possible benefits. Studies show that the risk for type 2 diabetes is lower among regular coffee drinkers than among those who don’t drink it. Also, coffee may reduce the risk of developing gallstones, discourage the development of colon cancer, improve cognitive function, reduce the risk of liver damage in people at high risk for liver disease, and reduce the risk of Parkinson’s disease. Coffee has also been shown to improve endurance performance in long-duration physical activities. For those who drink coffee to stay alert, new research suggests that you’ll stay more alert, particularly if you are fighting sleep deprivation, if you spread your coffee consumption over the course of the day. For instance, if you usually drink 16 ounces in the morning, try consuming a 2-3 ounce serving every hour or so. Again, moderation is the key.
http://www.health.harvard.edu/press_releases/coffee_health_risk.htm
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