Tallis Jason, Muhammad Bilal, Islam Mohammed, Duncan Michael J
School of Life Sciences, James Starley Building, Coventry University, Priory Street, Coventry, CV1 5FB, UK.
Muscle Nerve. 2016 Sep;54(3):479-86. doi: 10.1002/mus.25060. Epub 2016 May 26.
We examined the placebo effect of caffeine and the combined effect of caffeine and caffeine expectancy on maximal voluntary strength.
Fourteen men completed 4 randomized, single-blind experimental trials: (1) told caffeine, given caffeine (5 mg/kg) (CC); (2) told caffeine, given placebo (CP); (3) told placebo, given placebo (PP); and (4) told placebo, given caffeine (PC). Maximal voluntary concentric force and fatigue resistance of the knee flexors and extensors were measured using isokinetic dynamometry.
A significant and equal improvement in peak concentric force was found in the CC and PC trials. Despite participants believing caffeine would evoke a performance benefit, there was no effect of CP.
Caffeine caused an improvement in some aspects of muscle strength, but there was no additional effect of expectancy. Performance was poorer in participants who believed caffeine would have the greatest benefit, which highlights a link between expected ergogenicity, motivation, and personality characteristics. Muscle Nerve 54: 479-486, 2016.
我们研究了咖啡因的安慰剂效应以及咖啡因和咖啡因预期对最大自主力量的联合效应。
14名男性完成了4项随机单盲实验：（1）告知服用咖啡因，给予咖啡因（5毫克/千克）（CC）；（2）告知服用咖啡因，给予安慰剂（CP）；（3）告知服用安慰剂，给予安慰剂（PP）；（4）告知服用安慰剂，给予咖啡因（PC）。使用等速测力法测量膝关节屈伸肌的最大自主向心力量和抗疲劳能力。
在CC和PC实验中，向心峰值力量有显著且相同的改善。尽管参与者认为咖啡因会带来表现提升，但CP组没有效果。
咖啡因在某些方面改善了肌肉力量，但预期没有额外影响。认为咖啡因会带来最大益处的参与者表现较差，这凸显了预期的促力作用、动机和个性特征之间的联系。《肌肉与神经》54: 479 - 486, 2016年。
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