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Exploring Localized Muscle Fatigue Responses at Current Upper-Extremity Ergonomics Threshold Limit Values.

Daniel M Abdel-Malek1, Ryan C A Foley1, Fahima Wakeely1

  • 1468151 Ontario Tech University, Oshawa, Canada.

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Summary

Higher duty cycles (DCs) in upper-extremity ergonomics lead to greater localized muscle fatigue (LMF). Current threshold limit values (TLVs) may overestimate acceptable contraction levels, especially at higher DCs, necessitating avoidance of high DC work.

Keywords:
ergonomicslocalized muscle fatiguephysical workthreshold limit values

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Area of Science:

  • Ergonomics and Occupational Health
  • Muscle Physiology
  • Biomechanical Engineering

Background:

  • A threshold limit value (TLV) equation was developed to prevent localized muscle fatigue (LMF) during repetitive upper limb tasks.
  • The equation predicts acceptable maximal voluntary contraction (% MVC) levels for specific duty cycles (DCs).
  • Experimental validation of this TLV curve is needed to guide practical application.

Purpose of the Study:

  • To evaluate localized muscle fatigue (LMF) responses under three different upper-extremity ergonomics threshold limit value (TLV) duty cycles (DCs).

Main Methods:

  • Eighteen participants performed intermittent isometric elbow flexion at low (20% DC, 29.6% MVC), medium (40% DC, 19.7% MVC), and high (60% DC, 13.9% MVC) workloads defined by the ACGIH TLV equation.
  • Localized muscle fatigue (LMF) in the biceps brachii was monitored using strength (MVC), electromyography (EMG) amplitude, mean power frequency (MnPF), and psychophysical ratings.

Main Results:

  • Significant differences in biceps mean power frequency (MnPF) and maximal voluntary contraction (MVC) were observed across all tested TLV workloads.
  • The high duty cycle (DC) condition resulted in the most substantial declines in both MnPF and MVC.

Conclusions:

  • Working at different duty cycles (DCs) along the ACGIH TLV curve does not yield equivalent prevention of excessive localized muscle fatigue (LMF).
  • Higher DC workloads induce a more pronounced LMF response.
  • Current TLVs for repetitive upper-extremity work may overestimate safe contraction thresholds, particularly at higher DCs.