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Related Experiment Video

Updated: May 23, 2025

Measurement of Spatial Stability in Precision Grip
09:36

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Establishing the reliability and validity for GripAble: A handheld sensor-based dynamometry device.

Elise Yee Yan Li1, Luke Steven Robinson1, Claire Stockdale1,2

  • 1Department of Occupational Therapy, Monash University - Peninsula Campus, Frankston, VIC, Australia.

Hand Therapy
|March 17, 2025
PubMed
Summary

The new GripAble device shows excellent reliability for measuring maximum grip strength in healthy adults. However, its readings differ significantly from the Jamar dynamometer, meaning they cannot be used interchangeably.

Keywords:
Hand grip strengthmuscle strength dynamometerreliabilityvalidity

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Area of Science:

  • Rehabilitation Engineering
  • Biomedical Instrumentation
  • Musculoskeletal Assessment

Background:

  • Maximum grip strength (MGS) assessment is crucial for evaluating hand and upper limb function.
  • The Jamar dynamometer is the gold standard but has limitations.
  • There is a need for reliable and valid alternative MGS measurement instruments.

Purpose of the Study:

  • To assess the reliability and validity of the GripAble device for MGS measurement in healthy adults.
  • To compare MGS readings between the GripAble and the Jamar dynamometer.
  • To evaluate user experience with both devices.

Main Methods:

  • Fifty-five healthy adults underwent two MGS assessments using a standardized protocol.
  • Intraclass correlation coefficient (ICC) was used to evaluate test-retest and inter-instrument reliability.
  • Bland-Altman plots were employed to assess concurrent validity and agreement between devices.

Main Results:

  • The GripAble demonstrated excellent test-retest reliability (ICC = 0.971-0.975).
  • Good-to-excellent inter-instrument reliability was found between GripAble and Jamar (ICC = 0.898-0.922).
  • GripAble measurements were approximately 63.3% of Jamar readings, with a mean difference of 9.44 kg.

Conclusions:

  • The GripAble is a reliable instrument for MGS assessment in healthy adults.
  • Due to significant reading differences, GripAble and Jamar dynamometer measurements should not be used interchangeably for individuals.
  • Users reported a preference for the GripAble device.