Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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©Journal of Sports Science and Medicine (2010) 09, 134 - 139

Research article
Potential for Non-Contact ACL Injury Between Step-Close-Jump and Hop-Jump Tasks
Li-I Wang1, , Chin-Yi Gu1, Wei-Ling Chen1, Mu-San Chang2
Author Information
1 National Dong Hwa University, Hualien, Taiwan
2 Center of Physical Education, Tzu Chi University, Hualien, Taiwan

Li-I Wang
‚úČ Department of Physical Education, National Dong Hwa University, No. 123, Hua-Hsi Rd., Hualien 970, Taiwan (R.O.C.).
Email: tennis01@mail.ndhu.edu.tw
Publish Date
Received: 01-12-2009
Accepted: 11-01-2010
Published (online): 01-03-2010
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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


           Key Points
  • The different landing techniques required for these two stop-jump tasks do not necessarily affect the jump height.
  • Hop-jump decreased the hip joint angular velocity at initial foot contact with ground, which could lead to an increasing peak posterior GRF during the landing phase.
  • Hop-jump decreased hip and knee joint angular flexion displacement during the landing, which could increase the peak vertical loading rate during the landing phase.
 
 
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