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 (2015) 14, 484 - 493

Research article
Lower Extremity Muscle Activation and Kinematics of Catchers When Throwing Using Various Squatting and Throwing Postures
Yi-Chien Peng1, Kuo-Cheng Lo2, Lin-Hwa Wang3 
Author Information
1 Institute of Physical Education, Health and Leisure Studies, National Cheng Kung University, Tainan, Taiwan
2 Physical Education Office, Kun Shan University, Tainan, Taiwan
3 Institute of Physical Education, Health and Leisure Studies, National Cheng Kung University, Tainan, Taiwan

Lin-Hwa Wang
‚úČ Institute of Physical Education, Health and Leisure Studies, National Cheng Kung University, No. 1 University Road, Tainan 701, Taiwan
Email: wanglh@mail.ncku.edu.tw
Publish Date
Received: 15-11-2014
Accepted: 10-04-2015
Published (online): 11-08-2015
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ABSTRACT

This study investigated the differences in joint motions and muscle activities of the lower extremities involved in various squatting postures. The motion capture system with thirty-one reflective markers attached on participants was used for motion data collection. The electromyography system was applied over the quadriceps, biceps femoris, tibialis anterior, and gastrocnemius muscles of the pivot and stride leg. The joint extension and flexion in wide squatting are greater than in general squatting (p = 0.005). Knee joint extension and flexion in general squatting are significantly greater than in wide squatting (p = 0.001). The adduction and abduction of the hip joint in stride passing are significantly greater than in step squatting (p = 0.000). Furthermore, the adduction and abduction of the knee joint in stride passing are also significantly greater than in step squatting (p = 0.000). When stride passing is performed, the muscle activation of the hamstring of the pivot foot in general squatting is significantly greater than in wide squatting (p < 0.05), and this difference continues to the stride period. Most catchers use a general or wide squatting width, exclusive of a narrow one. Therefore, the training design for strengthening the lower extremity muscles should consider the appropriateness of the common squat width to enhance squat-up performance. For lower limb muscle activation, wide squatting requires more active gastrocnemius and tibialis anterior muscles. Baseball players should extend the knee angle of the pivot foot before catching the ball.

Key words: Baseball, biomechanics, stride, electromyography, motion, kinetic chain


           Key Points
  • Common squatting width can enhance squat-up performance through strengthening lower body muscle.
  • Wide squatting width might improve lower body muscle activation, leading to more effective communication between the brain and the muscle group. The benefit might be improved coordination of lower body muscle.
  • Common and wide squatting width might be cycled through training to enhance the strengthen and coordination of the lower body muscle, respectively.
 
 
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