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Fatigue

Fatigue

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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Related Experiment Video

Updated: Feb 27, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Published on: August 8, 2019

Exploring the Relationship of Task Performance and Physical and Cognitive Fatigue During a Daylong Light Precision

Marcus Yung¹, Rahim Manji¹, Richard P Wells¹

¹University of Waterloo, Canada.

|June 29, 2017

Summary

This study shows that errors in light precision tasks over 8 hours mirror physical and cognitive fatigue. Understanding fatigue is key to improving operational performance and reducing errors in demanding work environments.

Keywords:

errors fatigue low-load work performance work measurement

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Published on: December 29, 2016

Area of Science:

Human Factors and Ergonomics
Occupational Health
Performance Psychology

Background:

Fatigue significantly impacts work quality and productivity, particularly in ergonomic contexts.
Existing laboratory studies often lack real-world relevance in fatigue exposure and comprehensive measurement.
A need exists to link physical and cognitive fatigue to task performance in realistic work settings.

Purpose of the Study:

To investigate the relationship between fatigue and operational performance during a simulated 8-hour light precision task.
To utilize a comprehensive battery of physical and cognitive measures to assess fatigue.
To analyze how fatigue influences errors in a simulated work environment.

Main Methods:

A simulated micropipetting task was used to track errors and fatigue over 8 hours.
Ten fatigue measures and errors in technique, precision, and targeting were collected.
Principal Component Analysis (PCA) was employed to analyze fatigue and error patterns.

Main Results:

Fatigue responses and error rates explained 50.9% of the variance across three principal components (PCs).
The PCs identified patterns related to upper extremity fatigue (central and peripheral), postural sway, and oculomotor changes.
Error rates exhibited similar patterns to physical and cognitive fatigue, and arousal levels.

Conclusions:

In an 8-hour light precision task, error rates correlate with physical and cognitive fatigue.
Findings illuminate the connection between fatigue and operational system performance, specifically task errors.
This research contributes to understanding how physical and cognitive fatigue processes manifest in work-related errors.