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 |
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