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Experimental Methods to Study Human Postural Control
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Generation of forward angular impulse with different initial conditions.

Witaya Mathiyakom1, Rand Wilcox2, Jill L McNitt-Gray3

  • 1Department of Physical Therapy, California State University Northridge, Northridge, CA, USA; Department of Biological Sciences, University of Southern California, Los Angeles, CA, USA.

Human Movement Science
|November 21, 2022
PubMed
Summary
This summary is machine-generated.

Athletes generate angular impulse differently in running versus standing forward somersaults. Initial body momentum dictates how athletes control center of mass (CoM) and reaction force (RF) for optimal dives.

Keywords:
DivingForward angular impulseLinear impulseMultijoint controlReaction forces

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Area of Science:

  • Biomechanics
  • Human movement analysis
  • Sports science

Background:

  • Generation of angular impulse is crucial for dynamic athletic movements.
  • Controlling the body's center of mass (CoM) relative to ground reaction forces (RF) is key to regulating angular impulse.
  • Task-specific initial conditions, such as horizontal momentum, may influence movement strategies.

Purpose of the Study:

  • To investigate how differences in initial center of mass (CoM) horizontal momentum affect the generation of forward angular impulse during standing (SFS) and running (RFS) forward somersaulting dives.
  • To compare the control of CoM relative to reaction force (RF), RF generation mechanisms, and net joint moments (NJMs) between SFS and RFS.

Main Methods:

  • Five skilled athletes performed SFS and RFS dives.
  • Sagittal plane kinematics and ground reaction forces (RFs) were recorded during the take-off phase.
  • Analysis focused on the relative orientation of CoM and RF, and resulting knee and hip net joint moments (NJMs).

Main Results:

  • Significant differences were observed in CoM-RF control, RF generation, and knee/hip NJMs between SFS and RFS.
  • In RFS, angular impulse was generated by placing feet anterior to the CoM, ensuring RF passed posterior to CoM.
  • In SFS, angular impulse was generated by positioning the CoM anterior to the feet before push-off, with RF passing posterior to CoM.

Conclusions:

  • Initial conditions, specifically initial CoM momentum, significantly influence the biomechanical strategies employed to generate angular impulse.
  • The nervous system adapts movement execution, including segment kinematics and RF direction, to achieve task objectives based on initial state.
  • Understanding these task-specific adaptations is vital for optimizing dive performance and injury prevention.