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Fatigue and recovery during and after static loading.

Linda M Rose1, W Patrick Neumann, Göran M Hägg

  • 1a Department of Health Systems Engineering, Unit of Ergonomics, School of Technology and Health , KTH, The Royal Institute of Technology , Huddinge , Sweden.

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This study on pushing tasks found that fatigue accumulates over repeated trials, impacting endurance and recovery. Optimal work-recovery ratios may involve intermediate load levels to minimize perceived discomfort and fatigue.

Keywords:
forceperceived discomfort/pain/fatigueresumption timesubjective assessment

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Area of Science:

  • Ergonomics and Human Factors
  • Occupational Health
  • Biomechanics

Background:

  • Understanding fatigue accumulation is crucial for optimizing work schedules and preventing injuries.
  • Previous research has focused on objective measures, but subjective perceptions of fatigue, pain, and discomfort are also key indicators.

Purpose of the Study:

  • To investigate the effects of varying loads and durations on endurance time (ET), resumption time (RT), and perceived discomfort, pain, or fatigue (PD) during a pushing task.
  • To analyze fatigue accumulation across two repeated trials and identify optimal work-recovery ratios.

Main Methods:

  • Subjective assessments of ET, RT, and PD were collected.
  • Objective measurement of maximum force-exerting capacity was performed.
  • A pushing task with varying loads and durations was conducted over two trials.

Main Results:

  • Fatigue accumulation was evident in Trial 2, indicated by shorter ET, longer RT, and higher PD, despite consistent maximum pushing force.
  • Perceived discomfort, pain, or fatigue (PD) linearly increased during loading and curvilinearly decreased during recovery.
  • An unexpected U-shaped relationship between RT and load level suggested lowest fatigue at intermediate loads.

Conclusions:

  • Workload management is essential, as fatigue significantly impacts performance and subjective experience.
  • The findings support the development of sustainable work-recovery models, particularly highlighting the benefit of intermediate load levels.
  • Integrating subjective and objective measures provides a comprehensive understanding of fatigue in occupational tasks.