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 (2011) 10, 31 - 38

Research article
Inter-Joint Coordination in Producing Kicking Velocity of Taekwondo Kicks
Young Kwan Kim1, Yoon Hyuk Kim1,2, , Shin Ja Im3
Author Information
1 Department of Mechanical Engineering, Kyung Hee University,
2 e-Spine Center, Kyung Hee University,
3 Department of Taekwondo, Kyung Hee University, Korea

Yoon Hyuk Kim
‚úČ Department of Mechanical Engineering, School of Engineering, e-Spine, ILRI, Kyung Hee University, 1 Seocheon-dong, Giheung-gu, Yongin-si, Gyeonggi-do, 446-701, Korea
Email: yoonhkim@khu.ac.kr
Publish Date
Received: 02-08-2010
Accepted: 25-10-2010
Published (online): 01-03-2011
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ABSTRACT

The purpose of this study was to investigate joint kinematics of the kicking leg in Taekwondo and to examine the role of inter-joint coordination of the leg in producing the kicking velocity. A new inter-joint coordination index that encompasses three- dimensional hip and knee motions, was defined and applied to the joint kinematic results. Twelve elite Taekwondo athletes participated in this study and performed the back kick, thrashing kick, turning-back kick and roundhouse kick. Our results indicate that the back kick utilized a combination of hip and knee extension to produce the kicking velocity, and was characterized by a pushlike movement. The thrashing kick and turning-back kick utilized a greater degree of hip abduction than the roundhouse kick and back kick, and included complicated knee motions. The new index successfully categorized the thrashing kick and turning-back kick into a push-throw continuum, indicating a change from negative index (opposite direction) to positive index (same direction) of hip and knee motions at the end of the movement. This strategy of push-throw continuum increases the kicking velocity at the moment of impact by applying a throwlike movement pattern.

Key words: Taekwondo, kicks, kinematics, inter-joint coordination


           Key Points
  • A variety of Taekwondo kicks have unique inter-joint coordination of the kicking leg.
  • The back kick used a combination of hip and knee extension to produce the kicking velocity, and was characterized by a pushlike movement.
  • The new index explained well the inter-joint coordination of three DOF joint motions of two joints in producing kicking velocity (positive values for throwlike movements and negative values for pushlike movements).
  • The index successfully categorized the thrashing kick and turning-back kick into a push-throw continuum.
 
 
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