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Related Experiment Videos

Muscle activity in wedge, parallel, and giant slalom skiing

R A Hintermeister1, D D O'Connor, G W Lange

  • 1Steadman Hawkins Sports Medicine Foundation, Vail, CO 81657, USA.

Medicine and Science in Sports and Exercise
|April 1, 1997
PubMed
Summary

Alpine skiers require greater muscle activity for giant slalom (GS) turns compared to parallel (P) and wedge (W) turns. Muscle activation patterns differ significantly across these skiing techniques, with leg and core muscles showing varied responses.

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Area of Science:

  • Sports Science
  • Biomechanics
  • Exercise Physiology

Background:

  • Alpine skiing involves complex movements requiring significant muscular engagement.
  • Different turn types (wedge, parallel, giant slalom) likely impose distinct biomechanical demands on skiers.
  • Understanding muscle activation patterns is crucial for performance optimization and injury prevention.

Purpose of the Study:

  • To compare muscle activity patterns across three alpine skiing turn styles: wedge (W), short radius parallel (P), and giant slalom (GS).
  • To identify specific muscles and their activation levels during different turn techniques.
  • To determine the relationship between turn complexity and overall muscle exertion.

Main Methods:

  • Six alpine skiers performed nine runs each of W, P, and GS turns.

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  • Electromyography (EMG) was used to record activity from 12 muscles on the right side of the body.
  • Repeated measures ANOVA was employed to analyze differences in average and peak EMG amplitudes.

    • Main Results:

    • Significant differences in average EMG amplitude were observed between all turn styles (W < P < GS) for vastus lateralis, medial hamstrings, biceps femoris, and external obliques.
    • Anterior tibialis, vastus medialis, rectus femoris, and rectus abdominis showed significantly less activity in W turns compared to P or GS.
    • Gluteus maximus activity was uniquely higher in W turns than P turns, while other muscles consistently showed higher activation in GS and P turns.

    Conclusions:

    • Giant slalom turns demand the greatest muscle activity, followed by parallel and then wedge turns, with the exception of the gluteus maximus.
    • Specific leg and core muscles exhibit differential activation patterns corresponding to the complexity of the skiing turn.
    • These findings provide insights into the biomechanical demands of alpine skiing and can inform training strategies.