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Exercise and Muscle Performance01:27

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Designing columns to withstand eccentric loads is a critical aspect of structural engineering, ensuring structures can support off-center loads without failure. This design process must account for the additional normal stresses introduced by eccentric loading, which can significantly influence a column's stress distribution and overall stability. An eccentric load applied to a column induces normal stresses that can be conceptualized as a combination of stresses due to an equivalent...
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Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
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Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
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Updated: Aug 30, 2025

Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations
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Stable vs. variable eccentric load. Do they induce different training and physical performance outcomes?

Carlos Galiano1, Pablo Floria1, Alejandro Muñoz-López2

  • 1Physical Performance & Sports Research Center, Universidad Pablo de Olavide, Seville, Spain.

European Journal of Sport Science
|August 26, 2022
PubMed
Summary
This summary is machine-generated.

Variable resistance training using rotary inertial devices (RIDs) improved counter-movement jump (CMJ) performance in athletes. However, increasing load variability did not enhance training outcomes beyond the inherent variability of RIDs.

Keywords:
EccentricFlywheel paradigmRotary inertial devicesStrength trainingVariable load

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Area of Science:

  • Sports Science
  • Exercise Physiology
  • Biomechanics

Background:

  • Athletic movements often occur in unpredictable contexts, questioning the efficacy of uniform training loads for optimal performance transfer.
  • Resistance training with variable loads may better mimic real-world athletic demands.
  • Rotary inertial devices (RIDs) offer a unique method for introducing load variability during resistance exercises.

Purpose of the Study:

  • To investigate the impact of unexpected eccentric load variability during resistance training on team sport players.
  • To compare the effects of training with variable versus stable loads using RIDs on athletic performance.
  • To determine if increased load variability enhances training outcomes beyond the inherent variability of RIDs.

Main Methods:

  • Sixty-three male team sport players were randomized into a variable training group (VTG), stable training group (STG), and control group (CG).
  • VTG and STG trained twice weekly for six weeks using half-squats with RIDs, with VTG experiencing unexpected load variability.
  • Performance metrics including squat force, counter-movement jump (CMJ), sprint, and change of direction were assessed pre- and post-intervention.

Main Results:

  • Both VTG and STG showed significant improvements in CMJ performance compared to CG.
  • Eccentric overload exposure with RIDs led to greater CMJ height improvements than previously reported for RIDs alone.
  • No additional benefits in physical performance or training outcomes were observed by increasing the load variability beyond the inherent variability of RIDs.

Conclusions:

  • Resistance training with RIDs, particularly with eccentric overload, can enhance explosive power (CMJ).
  • The inherent variability of RIDs appears sufficient for improving athletic performance, as further increasing load variability did not yield superior results.
  • Training programs should consider the inherent variability of RIDs when aiming to improve athletic performance in variable contexts.