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Activation patterns in forearm muscles during archery shooting.
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Activation patterns in forearm muscles during archery shooting.

Author: H Ertan Affiliation: Department of Physical Education and Sports, Middle East Technical University, Ankara 06531, Turkey. hertan@metu.edu.tr; B Kentel; ST Tümer; F Korkusuz
Edition/Format: Article Article : English
Publication:Human movement science, 2003 Feb; 22(1): 37-45
Database:From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
Other Databases: British Library SerialsArticleFirst
Summary:
A contraction and relaxation strategy with regard to forearm muscles during the release of the bowstring has often been observed during archery, but has not well been described. The purpose of this study was to analyze this strategy in archers with different levels of expertise; elite, beginner and non-archers. Electromyography (EMG) activity of the M. flexor digitorum superficialis and the M. extensor digitorum  Read more...
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Document Type: Article
All Authors / Contributors: H Ertan Affiliation: Department of Physical Education and Sports, Middle East Technical University, Ankara 06531, Turkey. hertan@metu.edu.tr; B Kentel; ST Tümer; F Korkusuz
ISSN:0167-9457
Language Note: English
Unique Identifier: 112341860
Awards:

Abstract:

A contraction and relaxation strategy with regard to forearm muscles during the release of the bowstring has often been observed during archery, but has not well been described. The purpose of this study was to analyze this strategy in archers with different levels of expertise; elite, beginner and non-archers. Electromyography (EMG) activity of the M. flexor digitorum superficialis and the M. extensor digitorum were recorded at a sampling frequency of 500 Hz, together with a pulse synchronized with the clicker snap, for twelve shots by each subject. Raw EMG records, 1-s before and after the clicker pulse, were rectified, integrated and normalized. The data was then averaged for successive shots of each subject and later for each group. All subjects including non-archers developed an active contraction of the M. extensor digitorum and a gradual relaxation of the M. flexor digitorum superficialis with the fall of the clicker. In elite archers release started about 100 ms after the fall of the clicker, whereas in beginners and non-archers release started after about 200 and 300 ms, respectively. Non-archers displayed a preparation phase involving extensive extensor activity before the release of the bowstring, which was not observed in elite and beginner archers. In conclusion, archers released the bowstring by active contraction of the forearm extensors, whereas a clear relaxation of the forearm flexors affecting the release movement was not observed.

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