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Area of Science:

  • Occupational health
  • Biomechanics
  • Ergonomics

Background:

  • Extremity strength testing is vital for assessing safe job performance, post-injury impairment, and return to function in industrial settings.
  • A need exists for comprehensive normative data on upper extremity isometric strength.

Purpose of the Study:

  • To develop normative reference data for upper extremity strength in industrial employees.
  • To examine the relationship between strength and physical job demands.

Main Methods:

  • Retrospective analysis of isometric strength tests (pinch, grip, wrist, elbow, shoulder) from 107,102 industrial employees.
  • Data analyzed in relation to sex, age, and job level (physical difficulty 1-5).

Main Results:

  • Higher strength scores correlated positively with more demanding job levels (P < 0.001).
  • Strength increased progressively with physical job demands for both sexes (P = 0.0002).
  • All strength scores varied significantly by age decade (P < 0.001); most correlated with job level (r≥0.50).

Conclusions:

  • Normative upper extremity strength data for industrial employees can aid in rehabilitation and recovery assessment.
  • Job level, age, and sex are critical factors when using normalized strength data as a post-injury reference.