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Do Motivational Placebo Cues Influence Resistance Training Adaptations?

Roberto Moriggi Júnior1, Denis Fabrício Valério1, Felipe Damas1

  • 1Universidade Estadual de Campinas, School of Physical Education, Department of Sport Sciences, Campinas, Brazil.

Perceptual and Motor Skills
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PubMed
Summary
This summary is machine-generated.

External motivational feedback did not enhance resistance training outcomes. This study found no placebo effect on muscle strength or lean mass gains in untrained individuals following a 14-week program.

Keywords:
beliefergogenic effectexercise trainingmuscle masspsychobiological response

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Psychobiology

Background:

  • The placebo effect influences physical performance, but its role in resistance training (RT) outcomes is understudied.
  • Few investigations explore placebo effects on RT-induced muscle strength and mass.
  • Understanding placebo effects can optimize training interventions.

Purpose of the Study:

  • To investigate if external motivational feedback strategies influence RT effectiveness.
  • To determine if a placebo effect enhances muscle strength and lean mass gains in untrained individuals.
  • To analyze the impact of motivational feedback on RT adaptations.

Main Methods:

  • Thirty-one untrained volunteers participated in a 14-week RT program.
  • Participants were divided into a PLACEBO group (with feedback) and a N-PLACEBO group (without feedback).
  • Muscle strength (1RM) and lean mass (DEXA) were measured pre- and post-training.

Main Results:

  • Both groups showed significant increases in 1RM strength and lean mass over time (p < 0.001).
  • No significant group-by-time interaction was observed for strength or lean mass.
  • External motivational feedback did not lead to additional gains compared to the control group.

Conclusions:

  • External motivational feedback strategies did not augment RT-induced muscle strength or lean mass gains.
  • No placebo effect was detected for the measured outcomes in this study.
  • Motivational strategies may not be sufficient to enhance RT adaptations in untrained populations.