드롭랜딩 시 Hamstring/Quadriceps ratio 불균형에 따른 하지의 동적 안정성 차이 분석 (Analysis on Differences in Dynamic Stability of Lower Extremity Caused by Unbalance of Hamstr ing/Quadr iceps Ratio Dur ing Drop-landing)

서지정보

· 발행기관 : 한국운동역학회
· 수록지 정보 : 한국운동역학회지 / 25권 / 1호 / 49 ~ 56페이지
· 저자명 : 홍완기, 김민

초록

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 droplanding. The study targeted 13 soccer players from C University who have not had any injuries or wounds in the lower extremity joints and in anyother 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 higherand 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 witha 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 thecontrolled rotatory powers of the thighs that were applied to the tibias supported by the ground. Finally, H/Q ratio, load factors, and mean and maximumEMG were significantly negatively related, whereas GRFx showed a positive relationship. In fact, these factors all affected the impact of the load fromthe 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 ofdrop landing.

영어초록

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 droplanding. The study targeted 13 soccer players from C University who have not had any injuries or wounds in the lower extremity joints and in anyother 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 higherand 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 witha 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 thecontrolled rotatory powers of the thighs that were applied to the tibias supported by the ground. Finally, H/Q ratio, load factors, and mean and maximumEMG were significantly negatively related, whereas GRFx showed a positive relationship. In fact, these factors all affected the impact of the load fromthe 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 ofdrop landing.

참고자료

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