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Paper Abstract and Keywords
Presentation 2009-01-19 11:55
Correlations between potentiation mechanisms of long-term plyometric training and performance; myoelectrical, chemomechanical potentiation and elastic energy utilization
Yu-Kuang Wu, Lien Yu-Hui, Kwan-Hwa Lin, Tiffany Ting-Fang Shih, Tyng-Guey Wang, Hsing-Kuo Wang (National Taiwan Univ.) MI2008-62
Abstract (in Japanese) (See Japanese page) 
(in English) This study measured potentiation effects of plyometric training (normalized electromyography in triceps surae, stiffness and elastic energy utilization of Achilles tendon) and investigated correlations between these effects and performances (voluntary electromechanical delay and jump height). Twenty-one subjects were randomly assigned to either the control group or to a training group that performed eight-weeks of plyometric training. Results: As compared with the performances before training, normalized electromyographies in soleus were significantly (p< or =0.001) increased after four weeks and eight weeks of training. Tendon stiffness (by daynamic ultrasonography), elastic energy storage, release and jump height collected after training were significantly increased (p<0.05), with a concomitantly reduced voluntary electromechanical delay (p=0.01). These variables also showed significant differences versus the control group (all p <0.05). Other variables remained un changed. Correlations were observed between tendon stiffness and either voluntary electromechanical delay (r=-0. 77, p=0.014) or jump height (r=0.54, p=0.031). Conclusions: Plyometric training specifically potentiated the normalized electromyography, tendon stiffness and elastic energy utilization in myotendinous complex of the triceps surae. Although these changes are possibly essential determinants, only increases of tendon stiffness were observed to correlate with performance improvements.
Keyword (in Japanese) (See Japanese page) 
(in English) tendon stiffness / energy utilization / / / / / /  
Reference Info. IEICE Tech. Rep., vol. 108, no. 385, MI2008-62, pp. 25-30, Jan. 2009.
Paper # MI2008-62 
Date of Issue 2009-01-12 (MI) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee MI  
Conference Date 2009-01-19 - 2009-01-21 
Place (in Japanese) (See Japanese page) 
Place (in English) National Taiwan University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Medical Imaging 
Paper Information
Registration To MI 
Conference Code 2009-01-MI 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Correlations between potentiation mechanisms of long-term plyometric training and performance; myoelectrical, chemomechanical potentiation and elastic energy utilization 
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Keyword(1) tendon stiffness  
Keyword(2) energy utilization  
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1st Author's Name Yu-Kuang Wu  
1st Author's Affiliation National Taiwan University (National Taiwan Univ.)
2nd Author's Name Lien Yu-Hui  
2nd Author's Affiliation National Taiwan University (National Taiwan Univ.)
3rd Author's Name Kwan-Hwa Lin  
3rd Author's Affiliation National Taiwan University (National Taiwan Univ.)
4th Author's Name Tiffany Ting-Fang Shih  
4th Author's Affiliation National Taiwan University (National Taiwan Univ.)
5th Author's Name Tyng-Guey Wang  
5th Author's Affiliation National Taiwan University (National Taiwan Univ.)
6th Author's Name Hsing-Kuo Wang  
6th Author's Affiliation National Taiwan University (National Taiwan Univ.)
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Speaker Author-6 
Date Time 2009-01-19 11:55:00 
Presentation Time 10 minutes 
Registration for MI 
Paper # MI2008-62 
Volume (vol) vol.108 
Number (no) no.385 
Page pp.25-30 
#Pages 6 
Date of Issue 2009-01-12 (MI) 

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