Stroke phase discrimination in breaststroke swimming using a tri-axial acceleration sensor device |
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| Authors: | Email author" target="_blank">Yuji?OhgiEmail author Hiroshi?Ichikawa Masanobu?Homma Chikara?Miyaji |
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| Institution: | (1) Faculty of Environmental Information, Keio University, 5322, Endo, Fujisawa, 252-8520 Kanagawa, Japan;(2) Doctoral Program of Health and Sport Sciences, University of Tsukuba, Japan;(3) Department of Maritime Science, Kobe University of Mercantile Marine, Japan;(4) Sports Information Section, Japan Institute of Sports Sciences, Japan |
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| Abstract: | Our previous study has demonstrated that the swimmer’s wrist acceleration in the crawl stroke and the breaststroke had distinctive
characteristics between subjects (Ohgiet al. 2000). In addition, stroke phase discrimination could be achieved for the crawl stroke by using the swimmer’s wrist acceleration.
This study provides evidence that the swimmer’s tri-axial wrist acceleration could be used for stroke phase discrimination
in the breaststroke. Swimmers’ triaxial wrist accelerations were measured and their underwater stroke paths calculated. The
authors examined the characteristics of the wrist acceleration, such as a local maximum or minimum, with reference to the
swimmers’ stroke paths. As a result, it was suggested that the three phases of the breaststroke, the recovery, the insweep
and the outsweep, could be distinguished using thex-axis (ulnar-radial axis) and they-axis (distal-proximal axis) acceleration. This methodology allows us to identify which stroke phase would be changed in skill
training or over training, and the acceleration sensor device has the potential to become a precise stroke pedometer or stroke
monitoring tool in the near future. |
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| Keywords: | acceleration sensor breaststroke stroke phase swimming |
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