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Related Experiment Video

Updated: Dec 29, 2025

Evaluating the Function of the Foot Core System in the Elderly
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Portable, One-Dimensional, Trunk-Flexor Muscle Strength Measurement System.

Jefferson Fagundes Loss, Edgar Santiago Wagner Neto, Tatiane Borsoi de Siqueira

    Journal of Sport Rehabilitation
    |February 7, 2020
    PubMed
    Summary

    This study validates a portable trunk-flexor strength measurement system. The system using calibrated barbells offers reliable and valid results for assessing trunk-flexor muscle strength.

    Keywords:
    concurrent validitydynamometerreliability

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    Area of Science:

    • Biomechanics
    • Sports Science
    • Physical Therapy

    Background:

    • Trunk-flexor muscle strength is crucial for athletic performance.
    • Objective strength measurement typically requires expensive, non-portable equipment like isokinetic dynamometers.
    • There is a need for accessible and valid strength assessment tools.

    Purpose of the Study:

    • To evaluate the concurrent validity of a portable, one-dimensional trunk-flexor muscle strength measurement system.
    • To determine the reliability of measurements obtained from this portable system through test-retests.
    • To provide an objective and accessible method for assessing trunk-flexor strength.

    Main Methods:

    • A portable measurement system utilizing calibrated barbells was developed.
    • Concurrent validity was assessed by comparing measurements to a gold standard (implied).
    • Reliability was tested through repeatability, time reproducibility, position reproducibility, and subject reproducibility assessments.
    • A maximum voluntary contraction test was performed by 15 subjects.

    Main Results:

    • The portable measurement system demonstrated acceptable concurrent validity.
    • High reliability was observed, with an intraclass correlation coefficient greater than .98.
    • The system proved to be repeatable across different conditions and subjects.

    Conclusions:

    • The portable trunk-flexor muscle strength measurement system is both valid and reliable.
    • This system offers a practical and objective alternative to traditional, costly equipment.
    • It can be effectively used for assessing trunk-flexor muscle strength in various settings.