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Comparison of Lower Extremity Muscle Function and Proprioception According to Anterior Cruciate Ligament Reconstruction in Taekwondo Demonstration Players
Korean J Sports Med 2019;37:171-177
Published online December 1, 2019;  https://doi.org/10.5763/kjsm.2019.37.4.171
© 2019 The Korean Society of Sports Medicine.

Sang Il Han, Jae Keun Oh, Ki Jae Song

Laboratory of Sports Medicine, Korea National Sport University, Seoul, Korea
Correspondence to: Ki Jae Song
Laboratory of Sports Medicine, Korea National Sport University, 1239 Yangjae-daero, Songpa-gu, Seoul 05541, Korea
E-mail: jordanforever@hanmail.net
Received September 24, 2019; Revised October 24, 2019; Accepted October 31, 2019.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
Purpose: The purpose of this study was to provide basic data for injury prevention and rehabilitation program development of Taekwondo demonstration team by comparing lower extremity muscles function and proprioceptive senses of Taekwondo demonstration team with or without anterior cruciate ligament (ACL) injury. The subjects were ACL injured Taekwondo demonstration player group (ATD, n=13) who underwent ACL reconstruction and Kukkiwon Taekwondo demonstration player group (KTD, n=13) without injury history.
Methods: To evaluate the lower extremity muscles function, we measured the flexor-extensor muscle strength ratio and isokinetic muscle strength of the knee joint using a isokinetic muscle strength measuring device. In order to investigate the proprioceptive sensory function, position sense, and threshold to detection of passive motion was using a isokinetic muscle strength measuring device. The experiment was conducted on average 26 months after surgery.
Results: The results of this study are as follows. There was no significant difference between the two groups in the knee joint flexor-extensor ratio. But there was a significant difference in Knee joint flexion and extension strength between two groups at an angular velocity of 60째/sec, 180째/sec, and 300째/sec. and KTD group was higher than ATD groups (p=0.014, p=0.001, p=0.029, p=0.005, p=0.043, p=0.041, respectively). There was no significant difference between the two groups in the proprioceptive sensory test.
Conclusion: The results of this study showed that the normal flexor to extensor ratio (50%70%), But it was close to the injury risk level. Therefore, the training program for the improvement of the muscle strength and the imbalance of the strength of the lower extremity muscle function should be performed in both groups.
Keywords : Anterior cruciate ligament, Lower extremity function, Proprioception, Taekwondo
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