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Isokinetic dynamometry: implications for muscle testing and rehabilitation.

L R Osternig

    Exercise and Sport Sciences Reviews
    |January 1, 1986
    PubMed
    Summary

    Isokinetic exercise, using dynamometers for muscle force analysis, offers benefits but requires careful interpretation of force recordings due to speed variations and artifacts. Proper analysis across speeds and joint angles is crucial for accurate results.

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    Area of Science:

    • Rehabilitative Medicine
    • Biomechanics
    • Exercise Physiology

    Background:

    • Isokinetic exercise is a popular rehabilitative modality due to isokinetic dynamometers providing dynamic muscle contraction data.
    • Isokinetic dynamometers offer safety, accommodating resistance, and muscle force analysis capabilities.

    Purpose of the Study:

    • To highlight considerations for interpreting force recordings from isokinetic dynamometry.
    • To discuss the limitations and nuances of isokinetic exercise analysis.

    Main Methods:

    • Analysis of force recordings from isokinetic dynamometers.
    • Examination of the relationship between speed, joint angle, and peak torque.
    • Comparison of in vivo and in vitro force-velocity curves.

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    Main Results:

    • Isokinetic exercise involves acceleration and deceleration phases, limiting constant velocity periods.
    • Peak torque position varies with motion speed, necessitating analysis across different speeds and joint angles.
    • In vivo force-velocity curves differ from in vitro curves, potentially due to neural inhibition.

    Conclusions:

    • Interpretation of isokinetic dynamometry data requires accounting for artifacts and speed-dependent variations.
    • Direct comparison of in vivo and in vitro force-velocity curves is not justified.
    • Submaximal warm-ups are recommended before maximal testing to prevent muscle strain.