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Updated: Jun 30, 2026

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Trunk Testing Using a Prototype Cybex II lsokinetic Dynamometer Stabilization System.

G J Davies, J A Gould

    The Journal of Orthopaedic and Sports Physical Therapy
    |January 1, 1982
    PubMed
    Summary

    This study used isokinetic dynamometer trunk testing to establish normative data for trunk flexion and extension. This provides clinically useful guidelines for sports screening, industrial medicine, and patient rehabilitation.

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    Area of Science:

    • Biomechanics
    • Sports Medicine
    • Physical Therapy

    Background:

    • Assessing trunk muscle strength and function is crucial for various medical and athletic applications.
    • Existing methods for trunk assessment may lack objective and standardized parameters.
    • The Cybex II isokinetic dynamometer offers a potential tool for precise trunk muscle evaluation.

    Purpose of the Study:

    • To conduct a pilot study evaluating trunk musculature using the Cybex II isokinetic dynamometer.
    • To establish normative data for trunk flexion and extension strength and performance.
    • To explore the clinical utility of isokinetic trunk testing for screening and rehabilitation.

    Main Methods:

    • 160 healthy subjects (98 males, 62 females) underwent trunk flexion and extension testing.

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  • A prototype apparatus provided stabilization in a standing position.
  • Testing included isometric holds and isokinetic repetitions at various speeds (30-120 degrees/second).

    • Main Results:

    • Peak torque, tension development rate, range of motion for peak torque, and total work were measured.
    • Ratios of trunk flexors to extensors were calculated for both isometric and isokinetic tests.
    • Normative data for trunk isokinetic performance were generated.

    Conclusions:

    • Isokinetic testing of trunk musculature provides clinically useful guidelines.
    • This method is valuable for sports screening and industrial medicine screening.
    • Objective parameters are established for discharging patients with trunk dysfunction.