Definition: "An ergogenic aid is any substance or phenomenon that enhances performance "
Athletes who drink coffee daily respond well to caffeine supplements
Coffee, energy drinks, tea and cola contain caffeine. If you consume those foods on a daily basis, your body has become accustomed to caffeine - and you therefore respond less well to caffeine supplementation. It sounds logical, but according to a human study published in 2011 in the Journal of Sports Sciences, things are a bit different.
On 2 occasions the cyclists took a placebo 90 minutes before the time trial. On 2 other occasions they took a dose of 3 milligrams of caffeine per kilo of body weight.
During a period of 4 days before the time trial, the subjects did not consume any foods containing caffeine. On 2 occasions the subjects took a placebo every day, on 2 other occasions they took a daily supplement containing 1.5 milligrams of caffeine per kilogram of body weight. So a test subject weighing 70 kilos consumed 105 milligrams of caffeine every day. That amounts to a big strong cup of coffee.
After an abstinence period, caffeine supplementation improved time by 1.49 minutes [P = 0.021]. If the subjects had consumed a small amount of caffeine daily, caffeine supplementation shortened the time by 2.07 minutes [P = 0.002].
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You should note that this applies to light caffeine users. Whether this also applies to men and women who use coffee as a staple food? You can't deduce that from this study?