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INTRODUCTION: Caffeine is considered the most widely used stimulant in the world. According to the American College of Sports Medicine (ACSM) the average consumption of caffeine in the USA is approximately 2 cups of coffee per day (200 mg). Caffeine is often referred to as a nutritional ergogenic aid, but it has no nutritional value. Caffeine that is ingested is rapidly absorbed from the stomach and peaks in the blood within the first two hours. Caffeine has the potential to affect all systems of the body, as it is absorbed by most tissue. The remaining caffeine is broken down in the liver and byproducts are excreted in urine. Recent work reported that ingestion of 3-9 mg of caffeine per kilogram (kg) of body weight one hour prior to exercise increased exercise performance in the laboratory.


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