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Related Experiment Videos

The pull in olympic weightlifting.

R M Enoka

    Medicine and Science in Sports
    |January 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Weightlifters utilize distinct force phases during the pull, including weighting and unweighting, to maximize barbell acceleration. Experienced lifters optimize these forces for peak performance.

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    Area of Science:

    • Biomechanics
    • Sports Science
    • Kinetics

    Background:

    • The double knee bend in weightlifting involves distinct extension and realignment phases.
    • Understanding vertical ground reaction forces is crucial for optimizing lifting technique.

    Purpose of the Study:

    • To analyze the vertical forces applied by weightlifters during the pull phase.
    • To correlate force application with the biomechanics of the double knee bend.

    Main Methods:

    • Data collection from five experienced weightlifters.
    • Measurement of vertical forces on the barbell and the lifter-barbell system.
    • Analysis of ground reaction force (Rz) components and impulse magnitudes.

    Main Results:

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  • Vertical ground reaction force (Rz) exhibited three phases: Weighting I, Unweighting, and Weighting II.
  • Relative Rz impulse magnitudes varied across phases: 118-141% (Weighting I), 74-89% (Unweighting), and 122-135% (Weighting II).
  • The most experienced lifter generated greater positive acceleration earlier, aligning with theoretical predictions.

    • Conclusions:

    • The double knee bend's second phase (realignment) corresponds to the Unweighting phase, characterized by barbell deceleration.
    • Enhanced extensor muscle activity during Unweighting appears to compensate for deceleration, contributing positively to overall lift performance.