Beedie Christopher J, Coleman Damian A, Foad Abigail J
Department of Sport Science, Tourism, and Leisure, Canterbury Christ Church University, Canterbury, UK.
Int J Sport Nutr Exerc Metab. 2007 Jun;17(3):259-69. doi: 10.1123/ijsnem.17.3.259.
The article describes a study examining placebo effects associated with the administration of a hypothetical ergogenic aid in sport. Forty-two team-sport athletes were randomly assigned to 2 groups. All subjects completed 3 x 30-m baseline sprint trials after which they were administered what was described to them as an ergogenic aid but was in fact 200 mg of cornstarch in a gelatin capsule. Group 1 was provided with positive information about the likely effects on performance of the substance, whereas Group 2 was provided with negative information about the same substance. The sprint protocol was repeated 20 min later. Although for Group 1 mean speed did not differ significantly between baseline and experimental trials, a significant linear trend of greater speed with successive experimental trials suggested that positive belief exerted a positive effect on performance (P < 0.01). Group 2 ran 1.57% slower than at baseline (P < 0.01, 95% confidence intervals 0.32-2.82%), suggesting that negative belief exerted a negative effect on performance. Collectively, data suggest that subjects' belief in the efficacy or otherwise of a placebo treatment might significantly influence findings in experimental research.
这篇文章描述了一项研究，该研究考察了与在运动中使用一种假设的促力补剂相关的安慰剂效应。42名团队运动运动员被随机分为两组。所有受试者完成了3次30米的基线冲刺试验，之后给他们服用一种被描述为促力补剂的物质，但实际上是装在明胶胶囊中的200毫克玉米淀粉。第1组被告知该物质对运动表现可能产生的积极影响，而第2组被告知关于同一物质的消极影响。20分钟后重复冲刺试验方案。虽然对于第1组，基线试验和实验性试验之间的平均速度没有显著差异，但随着连续实验性试验速度不断加快的显著线性趋势表明，积极信念对运动表现产生了积极影响（P < 0.01）。第2组比基线时慢了1.57%（P < 0.01，95%置信区间为0.32 - 2.82%），这表明消极信念对运动表现产生了消极影响。总体而言，数据表明受试者对安慰剂治疗效果的信念可能会显著影响实验研究的结果。
