Definition: "An ergogenic aid is any substance or phenomenon that enhances performance "
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23.12.2011 |
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Double your endurance capacity with caffeine-carnitine mix
Endurance athletes looking to boost their endurance – legally of course – may be interested in the study that nutritionists at the Korean Chonbuk National University published in 2001 in the Journal of Nutritional Science and Vitaminology. The researchers tested experimental sports drinks containing large amounts of caffeine and L-carnitine on rugby players. The results were promising.
Study
On one occasion the drink contained nothing extra [CON]. On a second occasion the drink contained 5 mg caffeine per kg bodyweight for each athlete [CAF]. On the third occasion the drink contained 15 g L-carnitine [CAR], and on the fourth occasion the drink contained both 5 mg caffeine per kg bodyweight and 15 g L-carnitine [CAF+CAR].
Caffeine prevents adenosine from working in the body. In its free form, adenosine attaches itself to the adenosine receptors and reduces the metabolic rate of cells. By inhibiting that process caffeine has a stimulatory effect. Caffeine also boosts the concentration of the signal molecule cAMP, which makes cells more alert to natural pep-hormones like adrenalin. As a result of these processes, muscles are able to work harder and longer, and fat cells also release more fatty acids into the bloodstream.
L-Carnitine has a less intrusive effect. It helps the mitochondria, the cells' energy powerhouses, to absorb more fatty acids and convert them into energy.
Results
Analyses of the athletes' blood suggested that the cocktail works in the way the theory would lead one to imagine. Caffeine chases fatty acids out of the fat cells, and L-carnitine induces the muscles to burn more fatty acids.
Conclusion
The doses used were high. If you are sensitive to caffeine, a dose of 5 mg per kg bodyweight can cause psychological side effects. Some people also report mild gastro-intestinal complaints after taking 15 g L-carnitine.
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