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Related Experiment Videos

Electromyographic analysis of two techniques for squat lifting.

R S Delitto, S J Rose, D W Apts

    Physical Therapy
    |September 1, 1987
    PubMed
    Summary

    Maintaining a "back-bowed-in" lumbar spine alignment during squat lifts increases erector spinae (ES) and oblique abdominal (OA) muscle activity, potentially offering better lumbar spine protection.

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    Area of Science:

    • Biomechanics
    • Kinesiology
    • Exercise Physiology

    Background:

    • Understanding muscle activation patterns during lifting is crucial for injury prevention.
    • Lumbar spine alignment significantly influences spinal loading and muscle engagement.

    Purpose of the Study:

    • To investigate the electromyographic (EMG) activity of erector spinae (ES) and oblique abdominal (OA) muscles.
    • To compare muscle activity under two lumbar spine alignments (BBI and BBO) and three different loads during squat lifting.

    Main Methods:

    • Nineteen healthy subjects performed squat lifts with varying lumbar spine alignments and loads.
    • EMG activity of ES and OA muscles was recorded and normalized to maximal voluntary isometric contractions.
    • A three-way repeated measures ANOVA analyzed the effects of spine position, timing, and load.

    Main Results:

    • Erector spinae (ES) muscle activity was significantly higher in the first half of the "back-bowed-in" (BBI) lift across all loads.
    • Oblique abdominal (OA) muscle activity was also greater in the first half of the lift, irrespective of lifting style.
    • Increased ES and OA muscle engagement was observed during the initial phase of the BBI lift.

    Conclusions:

    • The "back-bowed-in" lumbar spine alignment enhances the activation of erector spinae and oblique abdominal muscles during the initial phase of squat lifting.
    • This heightened muscle activity during the critical initial lifting period may contribute to improved lumbar spine protection.
    • Optimal lifting technique involves maintaining a lordotic lumbar spine posture for enhanced muscle stabilization.

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