Caffeine can improve the performance of athletes, but don't overdo it.

Italian driver VincenzoNibali won the race at the Tour de France, which ended on Sunday, after which the organizing committee tested VincenzoNibali for enhanced athletic drugs (stimulants).

VincenzoNibali and his teammates can choose to drink a few cups of coffee or cans of Red Bull before the game because caffeine is not on the World Anti-Doping Agency's list of banned drugs.

Although it is not forbidden, caffeine does have the effect of beating chicken blood. Just a few months ago, studies showed that caffeine made women volleyball players hit the ball harder and jump higher; rowers rowed longer; and cyclists rowed farther.

Most studies have shown that caffeine helps in almost all endurance races-improving overall performance by 1.5% Mel 5%, said MarkGlaister, a sports physiologist at St. Mary's University in the UK and author of a recent cycling study.

"among the supplements that athletes can take legally, caffeine has the most significant effect." "the exact reason is not clear, but we speculate that caffeine may increase the frequency of nerve transmission, or increase the scale of nerve transmission, and may have the effect of inhibiting exercise pain," he said. " Glaister says caffeine has this effect on exercise that takes more than a minute.

If athletes need to benefit from caffeine, their caffeine intake should be between 3 and 6 milligrams per kilogram of body weight, so a cyclist weighing 140 pounds, then he must drink 2-4 cups of normal-sized coffee, and the effect of caffeine on the body will not reach its maximum value after 30-60 minutes.

However, although caffeine is good, do not take too much caffeine, the result will be very miserable. Digesting more than the recommended amount of caffeine will not help improve performance, Glaister said. It may even cause symptoms such as anxiety, insomnia and instability, and large doses of caffeine can even be fatal. Although the caffeine in your drink won't make you reach this lethal dose, small pure caffeine pills sold online can!

In May, when a teenager in Ohio died of overdose of powdered caffeine, the Food and Drug Administration banned the sale of powdered caffeine on the grounds that existing kitchen equipment could not be accurately measured. The ground caffeine is said to contain 25 cups of caffeine in one teaspoon. Too much caffeine can speed up the heartbeat and lead to spasms and even death.