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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 12, 2026

Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations
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Neuromuscular Adaptations to Work-matched Maximal Eccentric versus Concentric Training.

Sumiaki Maeo1,2, Xiyao Shan1, Shun Otsuka1

  • 1Faculty of Sport Sciences, Waseda University, Tokorozawa, Saitama, JAPAN.

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Summary

Eccentric training yields superior neuromuscular improvements compared to concentric training, even when matched for total work. These strength gains are primarily driven by increased neural drive, not just mechanical loading.

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Area of Science:

  • Exercise Physiology
  • Neuromuscular Adaptations
  • Muscle Physiology

Background:

  • The relative contributions of mechanical loading versus total work to neuromuscular improvements from eccentric versus concentric training remain unclear.
  • Understanding these adaptations is crucial for optimizing training protocols.

Purpose of the Study:

  • To investigate neuromuscular adaptations following maximal eccentric versus concentric training, specifically matched for total work.
  • To differentiate the effects of higher torque versus total work in eccentric training.

Main Methods:

  • Twelve males underwent 10 weeks of unilateral knee extensor training (maximal eccentric vs. concentric) twice weekly.
  • Measurements included peak torque, electromyography (EMG), anatomical cross-sectional area (ACSA), and T2 relaxation time (muscle edema).
  • Whole muscle volume was assessed pre- and post-training.

Main Results:

  • Both eccentric and concentric training increased torque and EMG, with significantly greater gains in the eccentric group (torque +76%, EMG +73%).
  • Anatomical cross-sectional area and muscle volume increased only in the eccentric group (+4%).
  • Changes in EMG explained a substantial portion of torque improvements in both groups.

Conclusions:

  • Eccentric training elicits greater neuromuscular adaptations than concentric training, even when total work is equated.
  • The majority of strength gains observed are attributable to enhanced neural drive.
  • Muscle hypertrophy plays a smaller role in short-term strength gains compared to neural adaptations.