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Related Experiment Video

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Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations
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Contralateral Effects After Unilateral Strength Training: A Meta-Analysis Comparing Training Loads.

Rafel Cirer-Sastre1, Jose V Beltrán-Garrido2, Francisco Corbi1

  • 1National Institute of Physical Education of Catalonia (INEFC), University of Lleida, Lleida, Spain.

Journal of Sports Science & Medicine
|June 21, 2017
PubMed
Summary

To maximize strength gains in the inactive limb through cross-training, focus on lengthy, fast eccentric exercise protocols. Moderate volumes and rest intervals are key for optimal contralateral strength improvements.

Keywords:
Cross-educationcross transfereffect sizeimmobilization

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Area of Science:

  • Sports Science
  • Exercise Physiology
  • Human Movement

Background:

  • The cross-training phenomenon, where training one limb enhances the contralateral limb, is well-documented.
  • However, optimal training loads for maximizing these cross-education effects remain unclear.

Purpose of the Study:

  • To determine the specific unilateral strength training loads that yield the greatest strength increases in the inactive contralateral limb.
  • To identify optimal training parameters including duration, frequency, intensity, rest, and exercise type.

Main Methods:

  • A meta-analysis of 10 English-language studies, sourced from Web of Science, PubMed, and SPORTDiscus.
  • Included 409 participants; analyzed studies with a low risk of bias.

Main Results:

  • A pooled effect size of 0.56 (95% CI: 0.34–0.78) indicated significant contralateral strength gains.
  • Larger effect sizes were associated with longer protocols, fast eccentric exercises, 3 sets of 10 repetitions, and 2-minute rest periods.
  • No significant relationship was found between effect size and absolute volume, relative intensity, absolute duration, or speed of execution.

Conclusions:

  • Fast eccentric exercise sets with moderate volume and rest intervals are recommended for optimizing contralateral strength improvements.
  • This meta-analysis provides evidence-based guidelines for designing effective cross-training interventions.