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Home :: Why caffeine (but not coffee) helps you run faster...Caffeine - possibly the most popular drug in the world - is also one of the most controversial. According to some, caffeine increases your metabolic rate, making weight loss faster and easier. It's also supposed to boost performance in the gym. One common mistake is to assume that the effects of caffeine always extend to caffeinated drinks such as coffee. In fact, there is evidence to show that coffee does not have the same effect as caffeine. In a study carried out at the University of Guelph, researchers attempted to distinguish between the effects of caffeine taken as a capsule or in the form of coffee. Subjects were assigned to one of five groups, and asked to run on a treadmill to the point of voluntary exhaustion. The first group received a placebo (a placebo is a "fake" supplement used to reduce the influence of faith and belief in a treatment on the results of a study). Group two used caffeine capsules. The other three groups consumed either coffee, decaffeinated coffee, or decaffeinated coffee with caffeine added. Interestingly, the researchers found no differences in run time among the three trials in which coffee was ingested. The results were no different from the placebo trial. In sharp contrast, six of the nine subjects had their longest run after taking the caffeine capsules, increasing their run time to exhaustion by approximately 10 minutes. In short, it appears that some component of coffee interferes with the performance enhancing effects of caffeine. This isn't surprising, considering that when coffee beans are roasted, ground, and extracted in hot water, there are literally hundreds of other compounds dissolved along with caffeine. For example, a study in 1992 demonstrated that when one of these compounds was injected into rats, it actually slowed heart rate and lowered blood pressure, whereas caffeine has the opposite effect. Related Articles
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