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Standardizing upper arm movement definitions across observational and sensor-based methods: A Delphi consensus study

Anders Dreyer Frost1, Mikael Forsman, Luiz Augusto Brusaca

  • 1National Research Centre for the Working Environment, Lersø Parkallé 105, 2100 Copenhagen Ø, Denmark. adf@nfa.dk.

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Experts reached consensus on time-based definitions for fast upper arm movements and static postures, crucial for reducing musculoskeletal disorders. However, amplitude thresholds remain undefined, requiring further research for reliable ergonomic assessments.

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Area of Science:

  • Occupational Health
  • Ergonomics
  • Biomechanics

Background:

  • Repetitive upper arm movements cause significant musculoskeletal disorders, leading to sickness absence and productivity loss.
  • Current observational and sensor-based assessments lack standardized definitions, hindering cross-study comparisons and practical application.
  • Inconsistent definitions impede the reliable measurement of upper arm movements in occupational settings.

Purpose of the Study:

  • To establish consensus on threshold criteria for defining upper arm movements and static postures.
  • To explore differences between practical observability and biomechanical measurability in ergonomic assessments.
  • To improve standardization in defining upper arm exposure in research and practice.

Main Methods:

  • A two-round Delphi study involving 35 European experts was conducted following ACCORD guidelines.
  • Experts rated agreement on proposed definitions for upper arm movements and postures.
  • Consensus was defined as ≥75% agreement, with thematic analysis guiding definition revisions.

Main Results:

  • Consensus was reached on defining fast-paced movements as ≤1 second (80% agreement) and static postures as ≥4 seconds with ±5° movements (87% agreement).
  • No agreement was found on minimum amplitude thresholds for arm movements (e.g., 10° vs. 20°; 53% agreement).
  • Experts noted a conflict between observability (favoring higher amplitudes) and biomechanical relevance (favoring lower amplitudes), emphasizing velocity's importance.

Conclusions:

  • Time-based thresholds for fast movements and static postures offer a foundation for standardized ergonomic assessment.
  • The lack of consensus on amplitude thresholds necessitates field validation studies to determine reliability and predictive value for musculoskeletal health.
  • These findings promote transparency in defining upper arm exposure but highlight ongoing conceptual and methodological challenges.