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Reliability and validity of the Biodex system 3 pro isokinetic dynamometer velocity, torque and position measurements

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Abstract

This study quantitatively assessed the mechanical reliability and validity of position, torque and velocity measurements of the Biodex System 3 isokinetic dynamometer. Trial-to-trial and day-to-day reliability were assessed during three trials on two separate days. To assess instrument validity, measurement of each variable using the Biodex System 3 dynamometer was compared to a criterion measure of position, torque and velocity. Position was assessed at 5° increments across the available range of motion of the dynamometer. Torque measures were assessed isometrically by hanging six different calibrated weights from the lever arm. Velocity was assessed (30°/s to 500°/s) across a 70° arc of motion by manually accelerating the weighted lever arm. With the exception of a systematic decrease in velocity at speeds of 300°/s and higher, the Biodex System 3 performed with acceptable mechanical reliability and validity on all variables tested.

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Authors and Affiliations

  1. Department of Public Health, Georgia Southern University, PO Box 8076, Statesboro, GA , 30460-8076, USA

    Joshua M. Drouin

  2. Department of Sports Health Care, Arizona School of Health Sciences, 5850 E. Still Circle, Mesa, AZ , 85206, USA

    Tamara C. Valovich-mcLeod

  3. Department of Exercise and Sports Science, University of North Carolina, 237B HHP Building, PO Box 26170, Greensboro, NC , 27402-6170, USA

    Sandra J. Shultz

  4. Department of Education, Leadership and Foundations, University of Virginia, Rm. 268 Ruffner Hall, Charlottesville, VA , 22904, USA

    Bruce M. Gansneder

  5. School of Health and Human Performance, University of North Carolina at Greensboro, 400-A HHP Building, PO Box 26169, Greensboro, NC , 27402-6169, USA

    David H. Perrin

Authors
  1. Joshua M. Drouin
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  2. Tamara C. Valovich-mcLeod
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  3. Sandra J. Shultz
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  4. Bruce M. Gansneder
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  5. David H. Perrin
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Corresponding author

Correspondence to Joshua M. Drouin.

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Disclosure

The Biodex dynamometer used for this investigation was donated to the laboratory by Biodex Medical Systems. The authors have no commercial or proprietary interest in this device.

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Drouin, J.M., Valovich-mcLeod, T.C., Shultz, S.J. et al. Reliability and validity of the Biodex system 3 pro isokinetic dynamometer velocity, torque and position measurements. Eur J Appl Physiol 91, 22–29 (2004). https://doi.org/10.1007/s00421-003-0933-0

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  • DOI: https://doi.org/10.1007/s00421-003-0933-0

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