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Grip strength testing reliability

A Hamilton1, R Balnave, R Adams

  • 1Faculty of Health Sciences, University of Sydney, Australia.

Journal of Hand Therapy : Official Journal of the American Society of Hand Therapists
|July 1, 1994
PubMed
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This study found that isometric grip strength testing using the Jamar dynamometer shows good test-retest reliability across different scoring methods. Grip strength curve shape in healthy adults is primarily related to overall strength, not sincerity of effort.

Area of Science:

  • Kinesiology
  • Biomedical Engineering
  • Rehabilitation Science

Background:

  • Isometric grip strength is a common measure in clinical and research settings.
  • The Jamar dynamometer is a widely used device for assessing grip strength.
  • Understanding the reliability of this measurement is crucial for accurate patient assessment and research outcomes.

Purpose of the Study:

  • To evaluate the test-retest reliability of isometric grip strength measurements.
  • To compare the reliability of different methods for calculating grip strength scores.
  • To investigate the relationship between grip strength curve shape and sincerity of effort.

Main Methods:

  • Thirty-three healthy adults (16 men, 17 women) participated in the study.
  • Isometric grip strength was tested twice using the Jamar dynamometer with all five handle positions.

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  • Four scoring methods were analyzed: single trial, mean of two trials, mean of three trials, and highest of three trials.

    • Main Results:

    • Test-retest reliability was generally good across all methods and handle positions.
    • Handle position 1 showed slightly lower reliability compared to other positions, though still acceptable.
    • No significant difference in reliability was found between the four scoring methods.
    • Grip strength curve flattening was associated with lower overall grip strength, not necessarily a lack of effort.

    Conclusions:

    • Isometric grip strength testing with the Jamar dynamometer demonstrates reliable results.
    • The choice of scoring method (single, mean, or highest of trials) does not significantly impact reliability.
    • Grip strength curve shape is not a reliable indicator of sincerity of effort in this population.