Rogerson Shane, Riches Christopher J, Jennings Carl, Weatherby Robert P, Meir Rudi A, Marshall-Gradisnik Sonya M
School of Exercise Science and Sport Management, Southern Cross University Lismore, New South Wales, Australia.
J Strength Cond Res. 2007 May;21(2):348-53. doi: 10.1519/R-18395.1.
Tribulus terrestris is an herbal nutritional supplement that is promoted to produce large gains in strength and lean muscle mass in 5-28 days (15, 18). Although some manufacturers claim T. terrestris will not lead to a positive drug test, others have suggested that T. terrestris may increase the urinary testosterone/epitestosterone (T/E) ratio, which may place athletes at risk of a positive drug test. The purpose of the study was to determine the effect of T. terrestris on strength, fat free mass, and the urinary T/E ratio during 5 weeks of preseason training in elite rugby league players. Twenty-two Australian elite male rugby league players (mean +/- SD; age = 19.8 +/- 2.9 years; weight = 88.0 +/- 9.5 kg) were match-paired and randomly assigned in a double-blind manner to either a T. terrestris (n = 11) or placebo (n = 11) group. All subjects performed structured heavy resistance training as part of the club's preseason preparations. A T. terrestris extract (450 mg.d(-1)) or placebo capsules were consumed once daily for 5 weeks. Muscular strength, body composition, and the urinary T/E ratio were monitored prior to and after supplementation. After 5 weeks of training, strength and fat free mass increased significantly without any between-group differences. No between-group differences were noted in the urinary T/E ratio. It was concluded that T. terrestris did not produce the large gains in strength or lean muscle mass that many manufacturers claim can be experienced within 5-28 days. Furthermore, T. terrestris did not alter the urinary T/E ratio and would not place an athlete at risk of testing positive based on the World Anti-Doping Agency's urinary T/E ratio limit of 4:1.
刺蒺藜是一种草本营养补充剂，据称能在5至28天内显著增强力量并增加瘦肌肉量（15, 18）。尽管一些制造商声称刺蒺藜不会导致药检呈阳性，但其他人则认为刺蒺藜可能会增加尿睾酮/表睾酮（T/E）比值，这可能会使运动员面临药检呈阳性的风险。本研究的目的是确定在精英橄榄球联盟球员为期5周的季前训练期间，刺蒺藜对力量、去脂体重和尿T/E比值的影响。22名澳大利亚精英男性橄榄球联盟球员（均值±标准差；年龄 = 19.8±2.9岁；体重 = 88.0±9.5千克）进行匹配配对，并以双盲方式随机分为刺蒺藜组（n = 11）或安慰剂组（n = 11）。所有受试者都进行了结构化的大重量抗阻训练，作为俱乐部季前准备的一部分。每天服用一次刺蒺藜提取物（450毫克·天⁻¹）或安慰剂胶囊，持续5周。在补充前后监测肌肉力量、身体成分和尿T/E比值。经过5周的训练，力量和去脂体重显著增加，组间无差异。尿T/E比值组间无差异。得出的结论是，刺蒺藜不会像许多制造商声称在5至28天内就能实现的那样，显著增强力量或增加瘦肌肉量。此外，刺蒺藜不会改变尿T/E比值，也不会使运动员因世界反兴奋剂机构规定的尿T/E比值上限4:1而面临药检呈阳性的风险。
