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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Research
article
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POTENTIAL FOR NON-CONTACT ACL INJURY BETWEEN STEP-CLOSE-JUMP AND HOP-JUMP TASKS |
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Li-I Wang1  ,
Chin-Yi Gu1, Wei-Ling Chen1 and Mu-San Chang2 |
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1Department of Physical Education, National Dong Hwa University, Hualien, Taiwan, 2Center of Physical Education, Tzu Chi University, Hualien, Taiwan. |
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© Journal of Sports Science and Medicine (2010) 9, 134 - 139 |
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| ABSTRACT | |||
| This study aimed to compare the kinematics and kinetics during
the landing of hop-jump and step-close-jump movements in order to provide
further inferring that the potential risk of ACL injuries. Eleven elite
male volleyball players were recruited to perform hop-jump and step-close-jump
tasks. Lower extremity kinematics and ground reaction forces during landing
in stop-jump tasks were recorded. Lower extremity kinetics was calculated
by using an inverse dynamic process. Step-close-jump tasks demonstrated
smaller peak proximal tibia anterior shear forces during the landing phase.
In step-close-jump tasks, increasing hip joint angular velocity during initial
foot-ground contact decreased peak posterior ground reaction force during
the landing phase, which theoretically could reduce the risk of ACL injury. Key words: Stop-jump, inverse dynamics, shear force. |
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