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Related Concept Videos

Eccentric Loading01:16

Eccentric Loading

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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 in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

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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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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.
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical...
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Design of Columns under an Eccentric Load01:21

Design of Columns under an Eccentric Load

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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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Exercise and Muscle Performance01:27

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Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
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When an object is acted upon by a variable force, the amount of work done and the change in energy of the object can be more complex to calculate compared to when a constant force is applied. Work is the product of force and displacement, while energy is the capacity of a system to do work. When a constant force is applied to an object, the work done can be calculated as the product of the force and the distance moved in the direction of the force. However, when a variable force is applied, the...
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A Simple and Inexpensive Running Wheel Model for Progressive Resistance Training in Mice
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Eccentric overload differences between loads and training variables on flywheel training.

Alejandro Muñoz-López1, Fábio Yuzo Nakamura2, Marco Beato3

  • 1Departamento de Motricidad Humana y Rendimiento Deportivo, University of Seville, Seville, Spain.

Biology of Sport
|October 23, 2023
PubMed
Summary
This summary is machine-generated.

Flywheel exercises may show eccentric overload, particularly with speed-derived measures like angular speed and power. Lower loads are more effective for observing this effect and monitoring training responses.

Keywords:
Eccentric trainingInjury preventionResistance trainingSquatStrength

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Area of Science:

  • Sports Science
  • Biomechanics
  • Exercise Physiology

Background:

  • Eccentric overload in flywheel exercises is debated.
  • Understanding concentric:eccentric mechanical output ratios is crucial for optimizing training.

Purpose of the Study:

  • To analyze differences in concentric:eccentric mechanical output ratios across various loads and variables in the flywheel squat exercise.
  • To investigate the interaction between load and phase (concentric vs. eccentric) on mechanical outputs.
  • To determine conditions under which eccentric overload is most apparent.

Main Methods:

  • Twenty physically active men performed flywheel squats with five different moments of inertia.
  • Angular speed was measured via rotary encoder; vertical force via force plates.
  • Mean and peak values for speed, acceleration, power, force, and torque were calculated for concentric and eccentric phases.

Main Results:

  • A significant Load × Phase interaction was observed for mean angular speed, peak vertical force, peak angular acceleration, peak power, and peak torque.
  • Higher eccentric overload values were noted with speed-derived variables (angular speed, acceleration, power).

Conclusions:

  • Speed-derived peak variables and lower loads are more likely to demonstrate eccentric overload in flywheel squats.
  • These findings can inform the monitoring of responses to flywheel training protocols.