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Eccentric loading is a crucial concept in the study of structural engineering and mechanics, particularly when analyzing the stability and stress distribution in columns. Unlike centric loading, where the force is applied along the centroidal axis, causing uniform compression, eccentric loading occurs when a force is applied off-center. This off-center application introduces not only direct compressive stress but also bending stress, significantly influencing the column's behavior under...
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An ellipse is a fundamental conic section defined by the constant sum of distances from any point on its curve to two fixed points, known as the foci. This geometric property can be physically demonstrated using a pencil, string, and two pins. By anchoring the string at both ends and maintaining it taut with a pencil, one can trace the outline of an ellipse.The shape and extent of the ellipse are determined by its eccentricity, e, defined as the ratio of the distance between the center and a...
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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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Related Experiment Video

Updated: Feb 8, 2026

Isometric and Eccentric Force Generation Assessment of Skeletal Muscles Isolated from Murine Models of Muscular Dystrophies
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Contralateral repeated bout effect after eccentric exercise on muscular activation.

Yosuke Tsuchiya1, Koichi Nakazato2, Eisuke Ochi3

  • 1Faculty of Modern life, Teikyo Heisei University, Tokyo, Japan.

European Journal of Applied Physiology
|July 11, 2018
PubMed
Summary

Repeated eccentric contractions (ECCs) enhance muscle activation and provide similar protective benefits to both the exercised (ipsilateral) and non-exercised (contralateral) limbs in untrained men.

Keywords:
Contralateral adaptationCross-educationLengthening contractionsMuscle activationMuscle damage

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Area of Science:

  • Exercise Physiology
  • Muscle Physiology
  • Sports Science

Background:

  • Muscle damage from eccentric contractions (ECCs) is well-documented.
  • Repeated bout effect (RBE) describes protective adaptations following ECCs.
  • Understanding RBE in both ipsilateral and contralateral limbs is crucial.

Purpose of the Study:

  • To investigate the contralateral and ipsilateral repeated bout effects of eccentric contractions (ECCs).
  • To examine muscle fiber activation using transverse relaxation time (T2) via magnetic resonance imaging (MRI).
  • To compare the protective effects of ipsilateral RBE (IL-RBE) and contralateral RBE (CL-RBE).

Main Methods:

  • Eleven untrained men performed two bouts of 30 maximal ECCs of elbow flexors.
  • Measurements included maximal voluntary isometric contraction (MVC) torque, range of motion (ROM), soreness, cross-sectional area (CSA), and T2.
  • ECCs were performed on one arm initially, followed by ECCs on both arms after a 2-week interval.

Main Results:

  • Both IL-RBE and CL-RBE significantly inhibited MVC torque loss, ROM limitation, soreness, and CSA increase compared to the initial ECC bout.
  • Acute T2, an indicator of muscle fiber activation, was significantly elevated in both IL-RBE and CL-RBE compared to the initial ECC.
  • No significant differences were observed between IL-RBE and CL-RBE for most measured parameters.

Conclusions:

  • Increased muscle fiber activation is a potential mechanism underlying the CL-RBE of ECCs.
  • The protective magnitude of CL-RBE is comparable to IL-RBE in untrained young men.
  • ECCs induce protective adaptations that extend to the contralateral, unexercised limb.