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Placebo-induced decrease in fatigue: evidence for a central action on the preparatory phase of movement.

Alessandro Piedimonte1, Fabrizio Benedetti, Elisa Carlino

  • 1Department of Neuroscience, National Institute of Neuroscience, University of Turin Medical School, Corso Raffaello 30, Turin, 10125, Italy.

The European Journal of Neuroscience
|December 20, 2014
PubMed
Summary
This summary is machine-generated.

Placebos can reduce physical fatigue by acting centrally on the brain's preparatory phase of movement. This study shows placebos modulate the readiness potential, suggesting a neurobiological basis for placebo-induced fatigue reduction.

Keywords:
central governorexpectationmotor performanceplacebo effectreadiness potential

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Area of Science:

  • Neuroscience
  • Sports Science
  • Psychology

Background:

  • Placebos influence physiological functions and clinical outcomes through patient expectations.
  • The placebo effect is increasingly studied in physical performance, showing potential to enhance endurance and reduce perceived exertion.
  • The neurobiological mechanisms underlying placebo effects on physical performance remain largely unknown.

Purpose of the Study:

  • To investigate the neurobiological underpinnings of placebo effects on physical fatigue.
  • To determine if placebo administration affects central motor control mechanisms related to fatigue.

Main Methods:

  • Subjects performed repetitive index finger flexions.
  • The readiness potential, reflecting motor preparation in the supplementary motor area, was recorded.
  • A placebo group received a substance believed to be caffeine, while a control group received no treatment.

Main Results:

  • In the control group, fatigue and readiness potential amplitude increased with task repetition.
  • The placebo group reported decreased perceived exertion without a corresponding increase in readiness potential amplitude.
  • Placebo administration modulated the readiness potential, indicating central nervous system involvement.

Conclusions:

  • Placebos reduce central fatigue by acting on the anticipatory phase of movement.
  • The findings highlight the significant role of the central nervous system in generating fatigue.
  • This study provides novel neurobiological evidence for the placebo effect in physical performance.