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Reliability and Concurrent Validity of a Low-Cost Handgrip Dynamometer: The Camry.

Lucía Sánchez-Aranda1, Javier Fernández-Ortega2, Isabel Martín-Fuentes3

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The Camry dynamometer demonstrates high reliability and validity for handgrip strength assessment, offering an affordable alternative to costly devices. This makes crucial health and fitness testing more accessible for professionals and large-scale studies.

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Area of Science:

  • Biomedical engineering
  • Clinical kinesiology
  • Health sciences

Background:

  • Handgrip strength testing is a valid and reliable measure of health.
  • High costs of traditional dynamometers limit accessibility in various settings.
  • The Camry dynamometer presents a more affordable option for fitness surveillance.

Purpose of the Study:

  • To evaluate the test-retest reliability of the Camry dynamometer.
  • To assess intermodel and interinstrument reliability (Camry vs. TKK dynamometer).
  • To determine the concurrent validity of the Camry dynamometer using calibrated weights.

Main Methods:

  • A comparison study involving a TKK 5401 and two Camry EH101 dynamometers (new and old).
  • Intrainstrument and interinstrument reliability were assessed.
  • Concurrent validity was evaluated using calibrated known weights and the Bland-Altman method.

Main Results:

  • The Camry dynamometer exhibited very high intrainstrument reliability (test-retest).
  • Small mean differences were observed between Camry and TKK dynamometers.
  • The Camry dynamometer demonstrated smaller systematic errors in concurrent validity compared to the TKK.

Conclusions:

  • The Camry dynamometer is a highly reliable and valid tool for handgrip strength assessment.
  • Its affordability makes handgrip strength testing more accessible in diverse healthcare and fitness settings.
  • The device maintains accuracy and durability even after extensive use.