The effects of Tribulus terrestris on body composition and exercise performance in resistance-trained males
2000
Antonio, J. | Uelmen, J. | Rodriguez, R. | Earnest, C.
The purpose of this study was to determine the effects of the herbal preparation Tribulus terrestris (tribulus) on body composition and exercise performance in resistance-trained males. Fifteen subjects were randomly assigned to a placebo or tribulus (3.21 mg per kg body weight daily) group. Body weight, body composition, maximal strength, dietary intake, and mood states were determined before and after an 8-week exercise (periodized resistance training) and supplementation period. There were no changes in body weight, percentage fat, total body water, dietary intake, or mood states in either group. Muscle endurance (determined by the maximal number of repetitions at 100-200% of body weight) increased for the bench and leg press exercises in the placebo group (p < .05; bench press +/- 28.4%, leg press +/- 28.6%), while the tribulus group experienced an increase in leg press strength only (bench press +/- 3.1%, not significant; leg press +/- 28.6%, p < .05). Supplementation with tribulus does not enhance body composition or exercise performance in resistance-trained males.
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