Ergogenic Aid

Guarana is also used as an ergogenlc aid by some athletes, most likely because caffeine and theophylline have been used In this way, to Improve performance In training and competition (Graham 2001). No human studies testing guarana for effects on physical performance could be located. Referring to caffeine studies, it appears that ergogenic effects are observed under some conditions but not others (Doherty et al 2002, Hunter et al 2002, Ryu et al 2001). Testing guarana in several animal models has also produced contradictory results. Significant increases in physical capacity have been observed with a dose of 0.3 mg/mL of a guarana suspension after 100 and 200 days' treatment. However, the same effect was not seen with a concentration of 3.0 mg/mL nor of a solution of caffeine 0.1 mg/mL (Espinola etal 1997).

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