Find a good placebo:
This study used false information about a placebo (milk-sugar tablet) to induce expectancies regarding force production. Forty-two college students were assigned to a placebo/placebo (PP), placebo/no-placebo (PN), or control group, and underwent baseline testing and two trials assessing one-repetition maximum (1 RM) strength on a bench press and seated leg press. The PP and PN groups improved significantly compared to the control at Trial 1 for the bench press (p ≤ .01) and leg press (p ≤ .01). Disclosure of the true nature of the placebo resulted in force production declines in the PN group to levels approximating controls on the bench press (p > .05) and seated leg press (p > .05). The results suggest that placebo-associated expectancy effects played a significant part in the observed changes. Implications include information for coaches, teachers, and fitness enthusiasts about the importance of psychological factors in successful performance.
Source: “The Effect of Placebo-Induced Changes in Expectancies on Maximal Force Production in College Students” from Journal of Applied Sport Psychology, Volume 19, Issue 1 January 2007 , pages 116 – 124
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