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Alpine Ski Motion Characteristics in Slalom.

Robert C Reid1,2, Per Haugen1, Matthias Gilgien1,2

  • 1Department of Physical Performance, Norwegian School of Sport Sciences, Oslo, Norway.

Frontiers in Sports and Active Living
|December 21, 2020
PubMed
Summary
This summary is machine-generated.

This study compared skier trajectories to theoretical models, finding good agreement for slalom turns. Ski design significantly impacts skier technique and tactics in competitive racing.

Keywords:
alpine skialpine skiingski characteristicsski mechanicsski motionski-snow interaction

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Area of Science:

  • Biomechanics of skiing
  • Sports engineering
  • Snow sports dynamics

Background:

  • Understanding ski function is key to improving skier technique and race tactics.
  • Theoretical models of ski-snow interaction mechanics provide a basis for analyzing ski trajectories.
  • Ski geometry plays a crucial role in determining ski motion and performance.

Purpose of the Study:

  • To quantify ski motion characteristics using 3D kinematic data from elite skiers in slalom simulations.
  • To compare measured ski trajectories with theoretical predictions based on ski geometry.
  • To investigate the influence of ski design on skier technique and tactics.

Main Methods:

  • Collected 3D kinematic data of highly-skilled skiers during slalom race simulations.
  • Analyzed ski motion characteristics, including edging angles and turn radii.
  • Compared experimental results with theoretical predictions from established models (e.g., Howe, 2001).

Main Results:

  • Maximum ski edging angles reached up to 71.0 ± 1.9° for 13 m gate spacing.
  • Minimum turn radii were measured at 3.96 ± 0.23 m (10 m gates) and 4.94 ± 0.59 m (13 m gates).
  • Experimental turn radii closely matched theoretical predictions based on edging angles.

Conclusions:

  • The study validates theoretical models for predicting slalom turn radii based on ski edging.
  • Findings support the role of the ski shovel in groove formation during carving.
  • Further research is needed on the interaction between ski geometry, physical properties, and trajectory at low edge angles.
  • Ski design has significant implications for competitive slalom skiing technique and tactics.