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Muscular fatigue patterning in power grip assessment.

L D Robertson1, C M Mullinax, G R Brodowicz

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Summary

A maximal, repetitive, static power grip test effectively detects differences in wrist-hand strength-endurance between uninjured, injured, and insincere worker groups. This reliable method aids in identifying occupational injury risks.

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Area of Science:

  • Occupational Health and Safety
  • Musculoskeletal Biomechanics
  • Ergonomics

Background:

  • Physical fatigue, particularly muscular fatigue from repetitive hand tasks, is a significant risk factor for occupational injuries.
  • Accurate assessment of wrist-hand strength-endurance is crucial for identifying workers at risk.

Purpose of the Study:

  • To evaluate a maximal, repetitive, static power grip test for its ability to differentiate between workers with uninjured hands, injured hands, and those feigning exertion.
  • To assess the validity and reliability of the power grip protocol in measuring wrist-hand strength-endurance.

Main Methods:

  • Utilized a maximal, repetitive, static power grip test protocol.
  • Measured power grip muscular force using a force strain gauge as the primary dependent variable.
  • Analyzed force fatigue curves and developed an endurance index based on force decrement.

Main Results:

  • The power grip protocol demonstrated validity and reliability in estimating wrist-hand strength-endurance.
  • Force fatigue curves exhibited both linear and curvilinear patterns across the study groups.
  • An endurance index effectively differentiated between uninjured, injured, and insincere exertion groups.

Conclusions:

  • The maximal, repetitive, static power grip test is a valid and reliable tool for assessing wrist-hand strength-endurance.
  • This testing method can distinguish between genuine and insincere exertions, and identify differences in workers with injured hands.
  • Findings support the use of this protocol in occupational health settings to identify injury risks associated with hand grip tasks.