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Paper Abstract and Keywords
Presentation 2010-05-21 14:15
A quantitative evaluation of pitcher's pectoral tension during baseball pitching
Ryo Ito, Toyohiko Hayashi, Yoshinobu Maeda, Tetsuya Watanabe (Niigata Univ.), Yasuo Nakamura (Doshisha Univ.), Hiroshi Tanaka, Hiroki Ninomiya, Masahiko Komai, Katsuya Nobuhara (Nobuhara Hospital) MBE2010-4
Abstract (in Japanese) (See Japanese page) 
(in English) In baseball pitching, pitcher’s pectoral tension is believed to be effective to accelerate the upper extremity. Then a term “pectoral tension” is frequently used subjectively in baseball training scenes. But its definition is still unclear, limiting its use in quantitative evaluation of pitching motion. In order to eliminate such limitation, we proposed an independent parameter capable of evaluating pitcher’s pectoral tension quantitatively. The parameter is defined as the area of a triangle formed by three marker points attached over the acromion, the manubrium of sternum and the processus xiphoideus. In order to evaluate its validity, we first introduced three necessary conditioned that the parameter should satisfy as follows 1) the non-throwing shoulder is in the horizontal flexion; 2) the hips rotate clockwise quickly relative to the chest when the area is maximized on the non-throwing side; 3) the maximum area is not correlated to the horizontal flexion/extension of the shoulder on the throwing side. Experiments using 15 adult and 15 young volunteers demonstrated that the proposed parameters satisfied all the conditions, suggesting its validity in pitching training.
Keyword (in Japanese) (See Japanese page) 
(in English) baseball pitching / pectoral tension / shoulder / hips / / / /  
Reference Info. IEICE Tech. Rep., vol. 110, no. 52, MBE2010-4, pp. 19-24, May 2010.
Paper # MBE2010-4 
Date of Issue 2010-05-14 (MBE) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
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 MBE  
Conference Date 2010-05-21 - 2010-05-21 
Place (in Japanese) (See Japanese page) 
Place (in English) Toyama Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) ME in general 
Paper Information
Registration To MBE 
Conference Code 2010-05-MBE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A quantitative evaluation of pitcher's pectoral tension during baseball pitching 
Sub Title (in English)  
Keyword(1) baseball pitching  
Keyword(2) pectoral tension  
Keyword(3) shoulder  
Keyword(4) hips  
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1st Author's Name Ryo Ito  
1st Author's Affiliation Niigata University (Niigata Univ.)
2nd Author's Name Toyohiko Hayashi  
2nd Author's Affiliation Niigata University (Niigata Univ.)
3rd Author's Name Yoshinobu Maeda  
3rd Author's Affiliation Niigata University (Niigata Univ.)
4th Author's Name Tetsuya Watanabe  
4th Author's Affiliation Niigata University (Niigata Univ.)
5th Author's Name Yasuo Nakamura  
5th Author's Affiliation Doshisha University (Doshisha Univ.)
6th Author's Name Hiroshi Tanaka  
6th Author's Affiliation Nobuhara Hospital and Institute of Biomechanics (Nobuhara Hospital)
7th Author's Name Hiroki Ninomiya  
7th Author's Affiliation Nobuhara Hospital and Institute of Biomechanics (Nobuhara Hospital)
8th Author's Name Masahiko Komai  
8th Author's Affiliation Nobuhara Hospital and Institute of Biomechanics (Nobuhara Hospital)
9th Author's Name Katsuya Nobuhara  
9th Author's Affiliation Nobuhara Hospital and Institute of Biomechanics (Nobuhara Hospital)
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Speaker Author-1 
Date Time 2010-05-21 14:15:00 
Presentation Time 25 minutes 
Registration for MBE 
Paper # MBE2010-4 
Volume (vol) vol.110 
Number (no) no.52 
Page pp.19-24 
#Pages 6 
Date of Issue 2010-05-14 (MBE) 

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