Korean Journal of Applied Biomechanics (한국운동역학회지)

Korean Society of Applied Biomechanics (한국운동역학회)
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Analysis on Differences in Dynamic Stability of Lower Extremity Caused by Unbalance of Hamstring/Quadriceps Ratio During Drop-landing

드롭랜딩 시 Hamstring/Quadriceps ratio 불균형에 따른 하지의 동적 안정성 차이 분석

  • Hong, Wan-Ki (Department of Physical Education, College of Physical Education, Chosun University) ;
  • Kim, Min (Department of Physical Education, Graduate School of Chosun University)
  • 홍완기 (조선대학교 체육대학 체육학과) ;
  • 김민 (조선대학교 대학원 체육학과)
  • Received : 2015.01.30
  • Accepted : 2015.03.16
  • Published : 2015.03.31
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Abstract

Objectives : The purpose of this study was to present quantitative data and basic references to decrease the accident risk of soccer instructors. Methods : To obtain data, we conducted an investigation on how H/Q ratio affects the dynamic stability of the lower extremity at the time of drop landing. The study targeted 13 soccer players from C University who have not had any injuries or wounds in the lower extremity joints and in any other parts of their bodies over the last 6 months. By using CMIS (USA), the players were divided into two groups according to H/Q ratios higher and lower than 69%, respectively. The subjects in each group were instructed to perform a drop landing. Results : The H/Q ratio did not affect the maximal flexion angle of the knee joints at the time of drop landing. In addition the dominant group with a relatively high H/Q ratio was observed to have increased time to reduce shock and to efficiently absorb the ground reaction force during drop landing. Also, the dominant group with a relatively high H/Q ratio utilized the strong performances of the antagonistic muscles around the hamstrings and the controlled rotatory powers of the thighs that were applied to the tibias supported by the ground. Finally, H/Q ratio, load factors, and mean and maximum EMG were significantly negatively related, whereas GRFx showed a positive relationship. In fact, these factors all affected the impact of the load from the H/Q ratio to the knee joints. Conclusion : From these findings it can be concluded that unbalanced H/Q ratio can be considered as a predictor of knee joint injury at the time of drop landing.

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References

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