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Related Experiment Video

Updated: Jun 30, 2026

Isokinetic Robotic Device to Improve Test-Retest and Inter-Rater Reliability for Stretch Reflex Measurements in Stroke Patients with Spasticity
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Isokinetic limb and trunk muscle performance testing: short-term reliability.

A L Friedlander, J E Block, N N Byl

    The Journal of Orthopaedic and Sports Physical Therapy
    |January 1, 1991
    PubMed
    Summary
    This summary is machine-generated.

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    This study assessed the short-term reliability of isokinetic muscle performance testing devices for knee and trunk movements. Results show strong reliability, with calculated minimum detectable changes crucial for evaluating short-term interventions.

    Area of Science:

    • Biomechanics
    • Exercise Physiology
    • Rehabilitation Science

    Background:

    • Reliability of isokinetic testing devices for trunk strength is not well-established.
    • Accurate assessment of muscle performance is vital for evaluating rehabilitation and training interventions.

    Purpose of the Study:

    • To assess the short-term reliability of two isokinetic muscle performance testing devices.
    • To determine the reliability of peak torque and best work measurements for knee and trunk movements.

    Main Methods:

    • 15 healthy subjects performed knee and trunk flexion/extension tests on two occasions, 24 hours apart.
    • Isokinetic testing was conducted at various speeds for both knee (90-240°/sec) and trunk (60-120°/sec).
    • Peak torque and best work (as % body weight) were analyzed for reliability using correlation and coefficient of variation (CV).

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    Main Results:

    • Strong correlations (r=0.82-0.96) were found between repeated measurements for both knee and trunk parameters across all speeds.
    • Coefficients of variation (CV) for reliability ranged from 4.4-8.7% for knee and 2.9-12.1% for trunk parameters.
    • Minimum detectable changes were calculated, indicating that larger changes are needed for individual significance compared to group analysis.

    Conclusions:

    • Isokinetic testing devices demonstrate good short-term reliability for assessing knee and trunk muscle performance.
    • Understanding measurement imprecision is critical for detecting statistically significant changes, especially with short-duration interventions.
    • These findings support the use of isokinetic testing in clinical and research settings for monitoring muscle performance changes.