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Strength testing with a portable dynamometer: reliability for upper and lower extremities.

J C Agre, J L Magness, S Z Hull

    Archives of Physical Medicine and Rehabilitation
    |July 1, 1987
    PubMed
    Summary
    This summary is machine-generated.

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    This study found a portable muscle dynamometer reliable for upper limb strength tests but unreliable for lower limb strength assessments. Further research is needed for accurate clinical muscle strength evaluation.

    Area of Science:

    • Kinesiology
    • Biomedical Engineering
    • Clinical Assessment

    Background:

    • Maximal muscle strength assessment is crucial for clinical evaluation.
    • Reliability of portable muscle dynamometers in clinical settings requires thorough investigation.

    Purpose of the Study:

    • To determine the intraobserver and interobserver reliability of maximal muscle strength measurements using a portable dynamometer.
    • To assess the reliability for both upper and lower extremity muscle groups.

    Main Methods:

    • Four healthy subjects were tested twice by three examiners using a portable muscle dynamometer.
    • Measurements included isometric strength of various upper and lower extremity muscles, plus cervical flexors and extensor hallucis longus via break tests.
    • Pearson correlation coefficients and coefficient of variation (CV) were calculated to assess reliability.

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    Main Results:

    • High reliability (correlation coefficients 0.85–0.99, CV 5.1%–8.3%) was found for upper extremity muscle strength testing.
    • Lower extremity muscle strength testing showed poor reliability (correlation coefficients -0.20–0.96, CV 11.3%–17.8%).
    • Break tests for cervical flexors and extensor hallucis longus also exhibited high variability (CV >17%).

    Conclusions:

    • The portable muscle dynamometer is reliable for clinical upper extremity muscle strength testing.
    • The dynamometer is unreliable for lower extremity muscle strength assessment.
    • Further research is necessary to develop accurate and reliable quantitative muscle strength evaluation methods for clinical use.