Placebo effects of caffeine on maximal voluntary concentric force of the knee flexors and extensors

Muscle & Nerve
Jason TallisMichael J Duncan

Abstract

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.

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Citations

Mar 13, 2018·Journal of the International Society of Sports Nutrition·Jozo GrgicZeljko Pedisic
Aug 16, 2019·European Journal of Sport Science·Philip HurstChris Beedie
Apr 9, 2019·International Journal of Sports Physiology and Performance·Sandro VenierPavle Mikulic
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Mar 4, 2020·Sports Medicine·Craig Pickering, Jozo Grgic
Apr 17, 2020·Journal of the International Society of Sports Nutrition·Jozo GrgicZeljko Pedisic
Oct 3, 2019·International Journal of Sports Physiology and Performance·Philip HurstChris Beedie
Jul 18, 2019·Frontiers in Psychiatry·Fabian WoltersAndrea W M Evers
Oct 10, 2018·Sports Medicine·Jozo GrgicZeljko Pedisic
Mar 7, 2021·Nutrients·Jorge Gutiérrez-HellínJuan Del Coso
Mar 4, 2021·Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme·Sharn ShelleyJason Tallis

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