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Related Experiment Video

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Measurement of Spatial Stability in Precision Grip
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Hand dynamometry: Does the device used for measurement matter?

Diana García Sastre1, Begoña Pintor de la Maza1, María López Melgar1

  • 1Endocrinology and Nutrition, Complejo Asistencial Universitario de León, León, Spain.

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Summary

Different handgrip dynamometers show good measurement correlation but significant bias. Saehan, Dynx, and Smedlay dynamometers should not be used interchangeably with the Jamar dynamometer due to insufficient agreement.

Keywords:
Bland AltmanCorrelación intraclaseDinamómetroDynamometerFuerza de agarre (HGS)Hand Grip Strength (HGS)Intraclass correlationSarcopenia

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Area of Science:

  • Biomedical Engineering
  • Clinical Measurement Science
  • Rehabilitation Medicine

Background:

  • Handgrip dynamometers are crucial for assessing muscle strength.
  • The Jamar dynamometer is considered the gold standard for grip strength measurement.
  • Evaluating alternative dynamometers is essential for clinical practice and research.

Purpose of the Study:

  • To compare the measurement consistency of Dynx, Saehan, and Smedlay dynamometers against the Jamar dynamometer.
  • To assess the correlation and concordance between different handgrip strength measurement devices.
  • To determine if interchangeable use of these dynamometers is appropriate.

Main Methods:

  • A cross-sectional study involving 124 participants (91 patients, 33 controls) between 2020-2021.
  • Grip strength was measured using Jamar, Dynx, Saehan, and Smedlay dynamometers in a randomized order.
  • Statistical analysis included intraclass correlation coefficient (ICC) and Bland-Altman plots.

Main Results:

  • Saehan demonstrated the highest correlation in both patient (0.977) and control groups (0.960).
  • Dynx showed strong correlation (0.967 in patients, 0.900 in controls).
  • Saehan exhibited the lowest bias (-0.39) and best limits of agreement, but significant bias and insufficient agreement were found between devices.

Conclusions:

  • While high correlation exists, significant bias and lack of agreement necessitate caution.
  • The tested dynamometers (Saehan, Dynx, Smedlay) are not interchangeable with the Jamar dynamometer.
  • Clinical decisions based on grip strength measurements should consider the specific dynamometer used.