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Related Concept Videos

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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Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

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Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
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Muscle Recovery and Fatigue01:24

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Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective...
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Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

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The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
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Related Experiment Video

Updated: Jan 1, 2026

Influence of Step-Width Manipulation on Running Biomechanics
06:53

Influence of Step-Width Manipulation on Running Biomechanics

Published on: February 28, 2025

855

Does fatigue alter step characteristics and stiffness during running?

Felipe García-Pinillos1, Antonio Cartón-Llorente2, Diego Jaén-Carrillo2

  • 1Department of Physical Education, Sports and Recreation, Universidad de La Frontera, Temuco, Chile.

Gait & Posture
|December 28, 2019
PubMed
Summary

Fatigue from running increases step variability and alters gait timing, reducing leg stiffness but not vertical stiffness in trained runners. This impacts understanding of the spring-mass model during endurance activities.

Keywords:
BiomechanicsFatigueGait analysisRunnersStep variability

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Area of Science:

  • Biomechanics
  • Exercise Physiology
  • Sports Science

Background:

  • Understanding how stressors affect gait is crucial for biomechanical models.
  • Spatiotemporal gait characteristics, variability, and stiffness are key variables.

Purpose of the Study:

  • To investigate the impact of running-induced fatigue on gait parameters.
  • To analyze changes in spatiotemporal gait, step variability, and leg/vertical stiffness.

Main Methods:

  • Twenty-two male endurance runners underwent a 60-minute time trial run.
  • Gait analysis measured spatiotemporal parameters, step variability, and stiffness pre- and post-fatigue.

Main Results:

  • Fatigue significantly altered temporal gait parameters (contact time, flight time).
  • Step variability (CV) increased across all measured parameters (CT, FT, SF, SL).
  • Leg stiffness (Kleg) decreased, while vertical stiffness (Kvert) remained unchanged.

Conclusions:

  • Running fatigue induces adaptations in gait characteristics and stiffness in trained runners.
  • Fatigue leads to increased step variability and reduced leg stiffness, impacting running economy and injury risk.