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General Case of Eccentric Axial Loading01:12

General Case of Eccentric Axial Loading

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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 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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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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Eccentric Force and Regional Biceps Femoris Muscle Excitation During Conventional and 80° Hip-Flexed Nordic Curl.

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Does an Adjusted Kinematic Model Predict the Relative Eccentric Force During Nordic Curl?

Maressa da Rocha1, Maria de C Macedo1, Geyson de L Batista1

  • 1Musculoskeletal Research Group-NIME, Department of Physical Therapy, Federal University of Juiz de Fora, Governador Valadares, MG,Brazil.

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Summary

Video analysis accurately predicts relative eccentric force (RelF) in Nordic curls using kinematic data, offering a portable and cost-effective alternative to traditional methods for assessing muscle strength.

Keywords:
dynamometryexercisestrain injurytechnology assessment

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Area of Science:

  • Biomechanics
  • Sports Science
  • Exercise Physiology

Background:

  • Assessing relative eccentric force (RelF) is crucial for understanding hamstring strength.
  • Current dynamometry methods for RelF assessment can be expensive and technically demanding.

Purpose of the Study:

  • To evaluate the efficacy of video-based kinematic variables, adjusted by intrinsic factors, in predicting RelF during Nordic curls.
  • To establish a portable and cost-effective method for RelF measurement.

Main Methods:

  • Twenty-one participants performed Nordic curls, with eccentric force measured by a device.
  • Video recordings were analyzed using Kinovea software to extract kinematic data (velocity, acceleration).
  • Multiple linear regression models were developed using kinematic, anthropometric, and age data to predict RelF.

Main Results:

  • The best prediction models combined angular velocity with age (r² = .627) and height (r² = .616).
  • Predicted RelF values showed excellent agreement and consistency with actual measurements (ICC = .77–.78).
  • The percentage of standard error of measurement was below 10%, indicating high reliability.

Conclusions:

  • Video-based kinematic analysis provides a reliable, portable, and low-cost method for predicting RelF in Nordic curls.
  • This approach offers a viable alternative to traditional dynamometry for assessing eccentric hamstring strength.