Definition: "An ergogenic aid is any substance or phenomenon that enhances performance "
Speed up interval-training fat loss with supplement containing caffeine and green tea
Short and intensive training can stimulate fat loss too, partly because the body burns more calories after highly intensive exertion. It's called the EPOC effect. Sports scientists at California State Polytechnic University will soon publish the results of a human study which shows that a supplement containing caffeine and a green-tea extract boosted post-workout calorie burning.
The interval training consisted of a 5-minute warm up, and then a 30-second sprint followed by 5 minutes of gentle cycling to recover. The subjects repeated this cycle of a short high-intensity burst and a longer low-intensity exertion three times.
The subjects did the interval training early in the morning before they had eaten. That's important information. After you've eaten, and certainly if you've had a high-protein meal, the enzymes in your body neutralise nearly all the polyphenols in green tea before they can be effective. If the subjects had already had breakfast the effect of the green tea in the supplement would have been considerably less.
In the 45 minutes after the interval training the supplement boosted both calorie expenditure and fat burning by 10 percent, as the figure above shows.
The supplement had no effect on heart rate or blood pressure. That's mainly because the researchers used subjects who were used to caffeine: they consumed at least 200 mg caffeine daily.