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Related Concept Videos

Eccentric Loading01:16

Eccentric Loading

792
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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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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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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Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

457
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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Stresses under Combined Loadings01:23

Stresses under Combined Loadings

370
When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
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Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

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Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
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Accentuated Eccentric Loading and Cluster Set Configurations in the Bench Press.

Alexandra D Lates1, Beau K Greer1, John P Wagle2

  • 1Department of Physical Therapy and Human Movement Science, Sacred Heart University, Fairfield, Connecticut; and.

Journal of Strength and Conditioning Research
|June 23, 2020
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Summary

Cluster sets with inter-repetition rest improved bench press power and velocity. Accentuated eccentric loading for the first repetition (AEL1) enhanced rate of force development, offering a unique training stimulus.

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Area of Science:

  • Sports Science
  • Biomechanics
  • Strength and Conditioning

Background:

  • Optimizing resistance training protocols is crucial for enhancing athletic performance.
  • Investigating novel loading strategies like accentuated eccentric loading (AEL) and cluster sets can provide performance benefits.

Purpose of the Study:

  • To compare the kinetic and kinematic differences of bench press using traditional loading, cluster sets, and AEL.
  • To evaluate the impact of inter-repetition rest on concentric performance and eccentric stimulus.

Main Methods:

  • Trained male subjects performed the bench press under four conditions: traditional load (TRAD), traditional load with inter-repetition rest (TRDC), AEL with inter-repetition rest (AELC), and AEL for the first repetition only (AEL1).
  • Concentric load was set at 80% of 1-repetition maximum (1RM), while eccentric overload (105% of 1RM) was applied using weight-releasing hooks in AEL conditions.

Main Results:

  • TRDC showed significantly superior concentric outputs in mean velocity and mean power compared to TRAD, AELC, and AEL1.
  • AEL1 demonstrated significantly greater effects on rate of force development compared to TRDC.
  • Inter-repetition rest positively influenced concentric performance, particularly mean power and velocity.

Conclusions:

  • Inter-repetition rest in cluster set configurations may be beneficial for achieving higher loads and sustained power outputs during the bench press.
  • AEL1 offers a distinct eccentric training stimulus that modifies loading parameters compared to traditional methods.