Skip to main content
Log in

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

  • Original Article
  • Published:
European Journal of Applied Physiology Aims and scope Submit manuscript

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.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1.
Fig. 2.
Fig. 3.
Fig. 4.
Fig. 5.
Fig. 6.
Fig. 7.

Similar content being viewed by others

References

  • Bemben MG, Grump KJ, Massey BH (1988) Assessment of technical accuracy of the Cybex II isokinetic dynamometer and analog recording system. J Orthop Sports Phys Ther 10:12–17

    Google Scholar 

  • Brown LE, Whitehurst M, Bryant JR, Buchalter DN (1993) Reliability of the Biodex System 2 isokinetic dynamometer concentric mode. Isokin Exerc Sci 3:106–163

    Google Scholar 

  • Denegar CR, Ball DW (1993) Assessing reliability and precision of measurement: an introduction to intraclass correlation and standard error of measurement. J Sport Rehabil 2:35–42

    Google Scholar 

  • Farrell M, Richards JG (1986) Analysis of the reliability and validity of the kinetic communicator exercise device. Med Sci Sports Exerc 18:44–49

    CAS  PubMed  Google Scholar 

  • Feiring DC, Ellenbecker TS, Dersheid GL (1990) Test-retest reliability of the Biodex isokinetic dynamometer. J Orthop Sports Phys Ther 11:298–300

    Google Scholar 

  • Gleeson NP, Mercer TH (1996) The utility of isokinetic dynamometry in the assessment of human muscle function. Sports Med 21:18–34

    CAS  PubMed  Google Scholar 

  • Handel M, Dickhuth HH, Mayer F, Gulch RW (1996) Prerequisites and limitations to isokinetic measurements in humans: Investigations on a servomotor-controlled dynamometer. Eur J Appl Physiol 73:225–230

    Google Scholar 

  • Iossifidou AN, Baltzopoulos V (2000) Inertial effects on moment development during isokinetic concentric knee extension testing. J Orthop Sports Phys Ther 30:317–327

    CAS  PubMed  Google Scholar 

  • Murray DA, Harrison E (1986) Constant velocity dynamometer: an appraisal using mechanical loading. Med Sci Sports Exerc 18:612–624

    CAS  PubMed  Google Scholar 

  • Patterson LA, Spivey WE (1992) Validity and reliability of the LIDO active isokinetic system. J Orthop Sports Phys Ther 15:32–36

    Google Scholar 

  • Portney LG, Watkins MP (2000) Statistical measures of reliability. In: Foundations of clinical research: applications to practice, 2nd edn. Prentice Hall, New Jersey, pp 557–584

  • Sapega AA, Nicholas JA, Sokolow D, Saraniti A (1982) The nature of torque "overshoot" in Cybex isokinetic dynamometry. Med Sci Sports Exerc 14:368–375

    PubMed  Google Scholar 

  • Shrout PE, Fleiss JL (1979) Intraclass correlations: uses in assessing rater reliability. Psychol Bull 86:420–428

    Article  Google Scholar 

  • Taylor NAS, Sanders RH, Howick EI, Stanley SN (1991) Static and dynamic assessment of the Biodex dynamometer. Eur J Appl Physiol 62:180–188

    Google Scholar 

  • Timm KE, Gennrich P, Burns R, Fyke D (1992) The mechanical and physiological performance reliability of selected isokinetic dynamometers. Isokin Exerc Sci 2:182–190

    Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Joshua M. Drouin.

Additional information

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.

Rights and permissions

Reprints and permissions

About this article

Cite this article

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

Download citation

  • Accepted:

  • Published:

  • Issue Date:

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

Keywords

Navigation