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Related Experiment Videos

Estimating Alpine Skiers' Energetics and Turn Radius Using Different Morphological Points.

Frédéric Meyer1, Fabio Borrani1

  • 1Institute of Sport Science, University of Lausanne, Lausanne, Switzerland.

Frontiers in Physiology
|December 18, 2018
PubMed
Summary
This summary is machine-generated.

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Determining alpine ski performance is challenging. Attaching antennas to the body for Global Navigation Satellite System (GNSS) analysis requires understanding the relationship between antenna position and the center of mass (CoM). The pelvis provides the most accurate CoM estimation for biomechanical analysis.

Area of Science:

  • Biomechanics
  • Sports Science
  • Performance Analysis

Background:

  • Alpine ski analysis faces challenges due to environmental factors and dynamic athlete movements.
  • Global Navigation Satellite System (GNSS) offers outdoor testing solutions, but accurately locating the center of mass (CoM) is critical.
  • The precise relationship between antenna attachment points and the true CoM in alpine skiing remains unquantified.

Purpose of the Study:

  • To compare different body attachment points for quantifying alpine skier performance using GNSS.
  • To evaluate the accuracy of using pelvis, head, and feet positions as surrogates for the CoM in biomechanical analysis.
  • To determine if simpler measurement points can reliably replace CoM calculations for energy and turn radius analysis in giant slalom (GS).

Main Methods:

Keywords:
GNSScentre of massgiant slalomkinetic energypotential energy

Related Experiment Videos

  • Developed 3D models of seven elite skiers during giant slalom (GS) using multi-camera motion tracking.
  • Calculated trajectories for the center of mass (CoM), pelvis, head, and feet.
  • Computed potential and kinetic energies and analyzed turn radius evolution, comparing results from different body points against the CoM.

Main Results:

  • The pelvis demonstrated the best estimation of the CoM, with no significant differences in most biomechanical parameters, except for a 2% difference in kinetic energy during the turn cycle.
  • The head showed less accuracy than the pelvis, with significant differences from the CoM ranging from 7% to 20% of the turn cycle.
  • The feet yielded the poorest results, exhibiting significant differences from the CoM between 16% and 41% of the turn cycle.

Conclusions:

  • Using the pelvis as a proxy for CoM in giant slalom (GS) analysis yields similar patterns for energies and turn radius.
  • Pelvis-based calculations allow for reliable analysis of mechanical and dissipation energy in GS.
  • This finding may facilitate the development and testing of simpler, more accessible alpine ski performance analysis methods.