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Static and dynamic assessment of the Biodex dynamometer.

N A Taylor1, R H Sanders, E I Howick

  • 1Department of Human Movement Science, University of Wollongong, NSW, Australia.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1991
PubMed
Summary

The Biodex dynamometer is a valid and accurate tool for measuring static and dynamic torque. However, users should exercise caution with dynamic data due to potential artifacts and limb-lever arm discrepancies.

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Area of Science:

  • Biomechanics
  • Kinesiology
  • Human Movement Science

Background:

  • Accurate measurement of joint torque and angular velocity is crucial in biomechanical research.
  • The Biodex dynamometer is a widely used device for such measurements.
  • Understanding its validity and accuracy under various conditions is essential.

Purpose of the Study:

  • To assess the validity and accuracy of the Biodex dynamometer.
  • To investigate its performance under static and dynamic testing conditions.
  • To identify potential sources of error in torque and angular velocity measurements.

Main Methods:

  • Static torque and angular position correlation with external data.
  • Dynamic testing of maximal voluntary knee extensions/flexions at various speeds (60-450°/s).

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  • Data collection using linear accelerometry, high-speed filming, and Biodex software.

    • Main Results:

    • Excellent correlation (r > 0.99) for static torque and position.
    • Dynamometer controlled angular velocity within 3.5% of preset values, with minor overshoots.
    • High-frequency torque artifacts observed at faster speeds and during directional changes, limb instability, and dynamometer resistance.

    Conclusions:

    • The Biodex dynamometer is a valid and accurate research tool for static and dynamic measurements.
    • Caution is advised when interpreting dynamic torque and angular velocity data.
    • Factors like tissue compliance and limb instability can influence measurement accuracy.