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Related Experiment Videos

[Software and system-induced errors in isokinetic force measurements]

C Schönle1, P Kling, C Bäumer

  • 1Orthopädische und Sportmedizinische Klinik, Bad Sassendorf.

Zeitschrift Fur Orthopadie Und Ihre Grenzgebiete
|January 1, 1995
PubMed
Summary

Isokinetic testing for low back pain patients shows high variability in peak torque and work values. Software discrepancies and patient-specific factors significantly influence these crucial isokinetic measurements.

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Area of Science:

  • Rehabilitation Medicine
  • Biomechanics
  • Physical Therapy

Context:

  • Isokinetic testing is widely used for assessing muscle strength and function.
  • Previous literature reports good reliability for isokinetic measurements.
  • High variability in results was observed in patients with low back pain.

Purpose:

  • To investigate the reliability of isokinetic trunk rotation measurements in low back pain patients.
  • To identify factors contributing to high variability in peak torque and work values.
  • To compare results obtained using original CYBEX software versus Iso-Kin 4.0 software.

Summary:

  • Testing 24 low back pain patients revealed significant variations in peak torque and work values, despite reported literature reliability.

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  • A 3-week training period showed average force increases between 10.7% and 23.2%, with 7 patients experiencing >30% change.
  • Discrepancies were found between CYBEX and Iso-Kin 4.0 software, with Iso-Kin 4.0 showing higher peak torque values (40-50%) and lacking daily calibration.
  • Other influencing factors include patient acceleration, psychological state, pain, motivation, learning effects, and signal artifacts.

    • Impact:

    • Highlights potential unreliability in isokinetic trunk rotation measurements for low back pain.
    • Identifies critical software differences and patient-related factors affecting test validity.
    • Suggests a need for standardized protocols and careful consideration of confounding variables in isokinetic assessments.