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Related Experiment Videos

Back stabilization during knee strengthening exercise

G Ricard, D P Currier

    Physical Therapy
    |September 1, 1977
    PubMed
    Summary
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    Adding a backrest during knee extension exercises increases maximal muscle force output. This finding highlights the importance of proper support for optimizing resistive knee exercises and enhancing muscle strength.

    Area of Science:

    • Biomechanics
    • Exercise Physiology
    • Musculoskeletal Research

    Background:

    • Maximal isometric contraction is a key measure of muscle strength.
    • Proper body positioning and support are crucial for accurate force measurement during exercise.
    • The influence of back support on knee extensor force production is not well-established.

    Purpose of the Study:

    • To investigate the effect of a backrest on maximal isometric force generated by knee extensor muscles.
    • To determine if back support enhances force production when body inclination is constant.

    Main Methods:

    • Twenty healthy women participated in the study.
    • Maximal isometric contractions of the right knee extensors were measured.
    • Testing was conducted with and without a backrest at fixed knee (60° extension) and hip (120° extension) angles.

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    Main Results:

    • A backrest significantly increased the force generated by the knee extensors.
    • Optimal body positioning with a backrest facilitated greater muscle force output.
    • The presence of a backrest improved subject comfort and stability.

    Conclusions:

    • Incorporating a backrest into exercise equipment enhances knee extensor force production.
    • Back support is recommended for designing effective knee exercise units.
    • Proper support optimizes the performance of resistive knee exercises.