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Related Experiment Video

Updated: Nov 7, 2025

Remote Limb Ischemic Preconditioning: A Neuroprotective Technique in Rodents
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Does ischemic preconditioning really improve performance or it is just a placebo effect?

Hiago L R de Souza1, Rhaí A Arriel1, Gustavo R Mota2

  • 1Physiology and Human Performance Research Group, Department of Physiology, Federal University of Juiz de Fora, Juiz de Fora, Minas Gerais, Brazil.

Plos One
|May 3, 2021
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Summary
This summary is machine-generated.

Ischemic preconditioning (IPC) did not enhance knee extension exercise performance. The study suggests the placebo effect is linked to IPC, making it difficult to isolate its true impact. A SHAM group is recommended for future IPC research.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Performance

Background:

  • Ischemic preconditioning (IPC) is investigated for potential ergogenic effects.
  • The placebo effect in response to IPC requires careful consideration.
  • Differentiating IPC's physiological impact from placebo response is challenging.

Purpose of the Study:

  • To evaluate the ergogenic effects of simultaneous ischemic preconditioning (IPC) and a SHAM intervention on knee extension resistance exercise performance.
  • To assess the influence of a placebo effect on exercise outcomes.
  • To determine if IPC enhances repetitions, maximal voluntary isometric contraction (MVIC), or reduces fatigue.

Main Methods:

  • Nine moderately trained men underwent three testing sessions.
  • Interventions included IPC (50 mmHg above systolic BP) and SHAM (20 mmHg) applied to alternating thighs.
  • Measurements comprised repetitions, MVIC, fatigue index, and perceptual indicators.

Main Results:

  • No significant differences in repetitions were found between baseline, IPC, and SHAM conditions.
  • The fatigue index and volume load showed no significant effect size after IPC or SHAM.
  • A significant reduction in MVIC was observed in both SHAM and IPC conditions compared to baseline for the left thigh.

Conclusions:

  • IPC application prior to leg extension exercise does not appear to yield ergogenic effects.
  • The placebo effect is strongly associated with IPC, making dissociation difficult.
  • The inclusion of a SHAM or placebo group is crucial for accurately interpreting IPC study results.