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Related Concept Videos

Fatigue01:21

Fatigue

245
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...
245
Machines: Problem Solving II01:30

Machines: Problem Solving II

376
Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. Consider a lifting tong carrying a 100 kg load. It comprises movable sections DAF and CBG linked together with member AB.
376
Muscle Recovery and Fatigue01:24

Muscle Recovery and Fatigue

2.5K
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...
2.5K

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Adaptations to fatigue during a repetitive multiplanar lifting task.

Emma J Ratke1, Dennis J Larson2, Michael W R Holmes1

  • 1Department of Kinesiology, Faculty of Applied Health Sciences, Brock University, St.Catherines, ON, Canada.

Applied Ergonomics
|June 30, 2025
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Summary

This study shows how warehouse workers adapt their movements when fatigued during repetitive lifting. Fatigue led to faster movements, reduced variability, and altered muscle activity, potentially increasing injury risk.

Keywords:
FatigueLiftingLow BackManual Materials Handling

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Area of Science:

  • Occupational Health
  • Biomechanics
  • Ergonomics

Background:

  • Repetitive lifting tasks in warehouses cause fatigue.
  • Existing research often overlooks ecologically relevant, multiplanar lifting tasks.
  • Understanding fatigue adaptations is crucial for preventing injuries.

Purpose of the Study:

  • To investigate movement adaptations due to fatigue during a 60-minute multiplanar lifting task.
  • To analyze changes in kinematics and muscle activity under sustained occupational load.
  • To assess the implications of these adaptations on injury risk.

Main Methods:

  • 28 participants performed continuous lifting, transferring, and lowering tasks for 60 minutes.
  • Full body kinematics and muscle activity (lumbar erector spinae, rectus abdominis, external oblique, anterior deltoids) were continuously recorded.
  • Analysis focused on changes in movement patterns and muscle activation over time.

Main Results:

  • A 4% decrease in load moment arm and a 4% increase in movement speed were observed.
  • Reduced variability (9%) in thorax-pelvis flexion deviation phase indicated altered coordination.
  • Increased rectus abdominis activity (4% MVIC) and decreased anterior deltoid activity (2%) were noted.

Conclusions:

  • Fatigue induces significant behavioral, coordination, and muscular adaptations during repetitive lifting.
  • These adaptations, including altered movement speed and muscle recruitment, may increase the risk of musculoskeletal injuries.
  • Further research into mitigating these fatigue-related risks is warranted.