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Accuracy of the Jamar dynamometer

R Härkönen1, R Harju, H Alaranta

  • 1Rehabilitation Unit, Invalid Foundation, Helsinki, Finland.

Journal of Hand Therapy : Official Journal of the American Society of Hand Therapists
|October 1, 1993
PubMed
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Calibration of Jamar dynamometers showed good repeatability between testers. Accuracy varied with load, with newer devices performing better. Normative hand grip values across handle positions were reviewed.

Area of Science:

  • Rehabilitation Medicine
  • Biomedical Engineering
  • Orthopedics

Background:

  • Hand grip strength is a crucial measure in assessing patient function.
  • Jamar dynamometers are widely used for grip strength assessment.
  • Ensuring the accuracy and reliability of these devices is essential for clinical practice.

Purpose of the Study:

  • To evaluate the calibration accuracy and repeatability of Jamar dynamometers.
  • To assess the influence of handle position and external force on measurement accuracy.
  • To compare the performance of older versus newer dynamometer models.

Main Methods:

  • Six Jamar dynamometers were calibrated using seven different external forces (5-60 kg).
  • Testing was conducted across five distinct handle positions.

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  • Repeatability was assessed by two different examiners.

    • Main Results:

    • No significant differences in accuracy were found across various grip widths.
    • Excellent repeatability was observed between the two examiners (average variation 1.2-1.4 kg).
    • Absolute error increased with heavier loads, while percentage error decreased.
    • Newer dynamometers demonstrated superior accuracy compared to older models.

    Conclusions:

    • Jamar dynamometers exhibit reliable repeatability for hand grip strength testing.
    • Calibration accuracy is influenced by load magnitude, with percentage error improving at higher forces.
    • Clinicians should consider the age of the dynamometer for optimal accuracy.
    • The study provides a review of normative hand grip values across different handle positions.