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Related Concept Videos

Fatigue01:21

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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, 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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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.
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Exploring the relationship between kinematic variability and fatigue development during repetitive lifting.

Nathalie M C W Oomen1, Ryan B Graham2, Steven L Fischer1

  • 1Department of Kinesiology, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada.

Applied Ergonomics
|November 6, 2022
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Summary

Motor variability (MV) is a consistent individual trait, supporting the repeaters-replacers hypothesis in repetitive lifting tasks. Some evidence suggests motor variability relates to fatigue resistance.

Keywords:
FatigueIndividual consistencyMotor variability

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Area of Science:

  • Biomechanics
  • Human Movement Science
  • Ergonomics

Background:

  • The variability-fatigue and repeaters-replacers hypotheses propose different mechanisms underlying motor control during fatiguing tasks.
  • Understanding motor variability (MV) and its relationship with fatigue is crucial for injury prevention and performance optimization in repetitive activities.

Purpose of the Study:

  • To investigate the variability-fatigue and repeaters-replacers hypotheses by assessing motor variability and fatigue during repetitive lifting.
  • To determine if motor variability is an individual trait and its association with fatigue resistance.

Main Methods:

  • Eighteen participants performed repetitive lifting tasks until volitional fatigue or a 1-hour limit.
  • Whole-body kinematics were captured to calculate 3D joint angle variability and continuous relative phase (CRP) of joint couplings.
  • Individual consistency of motor variability was assessed across lifting bouts.

Main Results:

  • Excellent individual consistency (ICC = 0.95-0.97) in motor variability was observed across fatigue development.
  • Motor variability was confirmed as an individual trait, supporting the repeaters-replacers hypothesis.
  • Associations were found between endurance, baseline effort, and lower body variability, with limited support for the variability-fatigue hypothesis.

Conclusions:

  • Motor variability is a stable individual characteristic, aligning with the repeaters-replacers hypothesis.
  • Findings suggest that individuals with different motor variability patterns may exhibit varying fatigue resistance, offering insights into the variability-fatigue hypothesis.