Korean Journal of Applied Biomechanics (한국운동역학회지)

Korean Society of Applied Biomechanics (한국운동역학회)
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Effects of Counter-rotation Position on Knee/Hip Angulation, Center of Mass Inclination, and Edging Angle in Simulated Alpine Skiing

  • Yoon, Sukhoon (Department of Community Sport, Korea National Sport University) ;
  • Kim, Jin-Hae (Department of Physical Education, Korea National Sport University) ;
  • Park, Jae-Hyeon (Department of Sport and Healthy Aging, Korea National Sport University) ;
  • Ryu, Jiseon (Department of Health and Exercise Science, Korea National Sport University) ;
  • Park, Sang-Kyoon (Department of Physical Education, Korea National Sport University) ;
  • Kim, Joo-Nyeon (Motion Innovation Centre, Korea National Sport University)
  • Received : 2017.04.26
  • Accepted : 2017.06.09
  • Published : 2017.06.30
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Abstract

Objective: To investigate rotation movement of segment for performing each position and its effect on knee/hip angulation, COM inclination, and edging angle changes. Method: Twelve Alpine skiers (age: $25.8{\pm}4.8years$, height: $173.8{\pm}5.9cm$, weight: $71.4{\pm}7.4kg$, length of career: $9.9{\pm}4.6years$) participated in this study. Each skier was asked to perform counter-rotation, neutral, and rotation positions. Results: Shank and thigh were less rotated in the counter-rotation position than in other positions, whereas the trunk and pelvis were more counter-rotated (p<.05). Hip angulation, COM inclination, and edging angle were significantly greater in the counter-rotation position than in other positions (p<.05). Conclusion: Our finding proved that the counter-rotation position increases hip angulation, COM inclination, and edging angle. Consequently, we suggest that skiers should perform counter-rotation of the trunk and pelvis relative to the ski direction in the vertical axis for the counter-rotation position. Further analysis will continue to investigate the effects of the counter-rotation position in real ski slope with kinetic analysis.

Keywords

References

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