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Related Experiment Videos

Regulation of angular impulse during two forward translating tasks.

Witaya Mathiyakom1, Jill L McNitt-Gray, Rand R Wilcox

  • 1University of Southern California, Los Angeles, CA, USA.

Journal of Applied Biomechanics
|July 3, 2007
PubMed
Summary
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Athletes regulate backward angular impulse by adjusting the body's center of mass (CoM) relative to ground reaction forces (GRF). Trunk-leg coordination is key to controlling this impulse during complex movements like reverse somersaults.

Area of Science:

  • Biomechanics
  • Human Movement Science
  • Sports Science

Background:

  • Angular impulse generation relies on the interplay between the body's center of mass (CoM) and ground reaction force (GRF) vectors.
  • Understanding how athletes control angular impulse is crucial for optimizing performance and preventing injuries in dynamic tasks.

Purpose of the Study:

  • To investigate the regulation mechanisms of backward angular impulse during forward-translating movements.
  • To test the hypothesis that trunk-leg coordination mediates the control of the CoM-GRF relationship.

Main Methods:

  • Eight skilled athletes performed standing reverse somersaults and reverse timers.
  • Sagittal plane kinematics, ground reaction forces (GRF), and lower extremity muscle electromyograms were recorded during takeoff.

Related Experiment Videos

  • Analysis focused on the push interval and trunk-leg coordination strategies.

    • Main Results:

    • Backward angular impulse was modulated by redirecting the GRF relative to the CoM.
    • In reverse timers, initial backward angular impulse was counteracted by limiting trunk rotation and adjusting GRF direction.
    • Biarticular muscles coordinated GRF direction and CoM trajectory through trunk-leg coordination.

    Conclusions:

    • Athletes actively control backward angular impulse by manipulating the CoM-GRF orientation.
    • Trunk-leg coordination, modulated by biarticular muscles, is essential for regulating angular impulse and movement trajectories.
    • These findings offer insights into the biomechanics of complex aerial maneuvers.