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Related Concept Videos

Impact Loading01:19

Impact Loading

185
Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...
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Design Consideration01:22

Design Consideration

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Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key...
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Fatigue01:21

Fatigue

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Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
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Load along a Single Axis01:29

Load along a Single Axis

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In structural engineering, the analysis of beams subjected to varying loads is a critical aspect of understanding the behavior and performance of these structural elements. A common scenario involves a beam subjected to a combination of different load distributions.
Consider a beam of length L subjected to a varying load, which is a combination of parabolic and trapezoidal load distribution along the x-axis. In this case, it is essential to determine the resultant loads, their locations, and...
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Relation Between the Distributed Load and Shear01:23

Relation Between the Distributed Load and Shear

604
Understanding the relationship between the distributed load and shear force in structural analysis is crucial for analyzing beams subjected to various loading conditions. Consider the case of a beam experiencing a distributed load, two concentrated loads, and a couple moment.
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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

249
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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Related Experiment Video

Updated: Jun 7, 2025

Using Gold-standard Gait Analysis Methods to Assess Experience Effects on Lower-limb Mechanics During Moderate High-heeled Jogging and Running
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Habitual Running Style Matters: Duty Factor, and Not Stride Frequency, Relates to Loading Magnitude.

Lennert Van der Meulen1, Senne Bonnaerens1, Ine Van Caekenberghe1,2

  • 1Department of Movement and Sports Sciences, Ghent University, Ghent, Belgium.

Journal of Human Kinetics
|November 20, 2024
PubMed
Summary

Running duty factor, not stride frequency, predicts lower limb loading in female runners. Higher duty factors are associated with reduced maximal loading and potential injury risk.

Keywords:
external forcesinverse dynamicsmusculoskeletal load

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Area of Science:

  • Biomechanics
  • Sports Science
  • Human Movement Analysis

Background:

  • Running style is characterized by temporal variables like duty factor and stride frequency.
  • The relationship between these temporal variables and the loading experienced during running is not fully understood.
  • Understanding this relationship is crucial for injury prevention and performance optimization.

Purpose of the Study:

  • To investigate the relationship between duty factor and stride frequency with external load measures, joint reaction forces, and joint moments in female recreational runners.
  • To determine which temporal variable, duty factor or stride frequency, is a better predictor of running-related loading.

Main Methods:

  • Thirty-one healthy female recreational runners participated.
  • Participants ran at a controlled speed (2.30 ± 0.05 m·s⁻¹) on a 25-m runway.
  • Ground reaction forces and motion capture data were collected to analyze maximal vertical ground reaction force, loading rate, braking force, and joint moments/forces at the knee and ankle.

Main Results:

  • Duty factor and stride frequency did not correlate with each other.
  • Duty factor significantly predicted maximal vertical ground reaction force, peak braking force, peak knee extension moment, ankle plantar flexion moment, and peak joint reaction forces at the knee and ankle.
  • Stride frequency showed no significant predictive value for any of the measured loading variables.
  • Duty factor did not predict the vertical instantaneous loading rate.

Conclusions:

  • Duty factor is a significant predictor of lower limb loading during running in female recreational runners.
  • Higher duty factors are associated with lower maximal loading and potentially reduced injury risk.
  • Stride frequency is not a reliable indicator of running-related loading in this population.