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Mind-set matters: exercise and the placebo effect.

Alia J Crum1, Ellen J Langer

  • 1Department of Psychology, Harvard University, 1330 William James Hall, 33 Kirkland St., Cambridge, MA 02138, USA. ajc@post.harvard.edu

Psychological Science
|April 12, 2007
PubMed
Summary
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A study found that informing hotel room attendants that their work is exercise improved their health outcomes, demonstrating the placebo effect. This mindset shift led to significant health benefits without changing actual physical activity levels.

Area of Science:

  • Psychology
  • Health Sciences
  • Behavioral Medicine

Background:

  • The relationship between physical activity and health is well-established.
  • Mindset and perception can influence physiological responses to health behaviors.
  • The role of psychological factors in mediating exercise benefits requires further investigation.

Purpose of the Study:

  • To investigate if mindset moderates the exercise-health relationship.
  • To determine if perceived exercise, rather than actual exercise, impacts health outcomes.
  • To explore the potential role of the placebo effect in exercise-induced health improvements.

Main Methods:

  • 84 female hotel room attendants were divided into an informed group and a control group.
  • The informed group received information framing their work as sufficient exercise.

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  • Physiological health variables were measured before and after a 4-week intervention period.

    • Main Results:

    • The informed group perceived increased exercise levels post-intervention, despite no change in actual behavior.
    • Compared to controls, the informed group showed significant reductions in weight, blood pressure, body fat, waist-to-hip ratio, and BMI.
    • These physiological changes occurred solely due to a change in perception about their work.

    Conclusions:

    • Mindset significantly influences health outcomes associated with exercise.
    • The placebo effect plays a crucial role in the exercise-health relationship.
    • Perception of physical activity can be as impactful as actual activity for certain health markers.