I recently read a research article named, "Mind-Set Matters: Exercise and the Placebo Effect" by Alia J. Crum and Ellen J. Langer. They were investigating the placebo effect and affecting your mind-set. Crum and Langer's participants were all female room attendants or house cleaning in a hotel. They randomly assigned the participants into two groups. The control group was not told anything, they were told to continue their job as normal. The experimental group was continually reminded they were getting a lot of exercise throughout their daily responsibilities at work. However, both groups were doing the same amount of work throughout the day.
At the end of the four week, study the control group behavior had not changed. However, the experimental group reported feeling much healthier to Crum and Langer. Not only did these participants report feeling healthier, when compared with the control group, they showed a decrease in weight, blood pressure, body fat, waist-to-hip ratio, and body mass index. I found this result fascinating. Both groups were doing exactly the same job. However, when one group was continually reminded how much exercise they were getting in their jobs, they actually became healthier.
This study reminded me of the cognitive dissonance theory. This theory suggests people need to justify their behavior, feel rational, and feel in control. According to Reeve, cognitive dissonance occurs from "inconsistency between what one believes (I am competent) and what one does (I act competently)..." (Reeve, pg. 278, 2009). Cognitive dissonance does not always refer to being psychologically uncomfortable, but also can be applied to your positive goals. The women who were reminded of how much exercise they were getting at work might strive to reduce any dissonance. They may believe they are working harder and therefore are healthier.
Although they attempted to control the study, there may have been possible problems with the participants. One issue would be exercising outside of work and the other issue may be working harder during their shift.
My question is what do people think of the placebo effect? Can it really alter your way of thinking?
Crum, A.J. & Langer, E.J. (2007). Mind-set matters: Exercise and the placebo effect. Psychological Science (18)2, 165-171.
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