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Sensors 2016, 16(4), 473; doi:10.3390/s16040473

Automatic Identification of Subtechniques in Skating-Style Roller Skiing Using Inertial Sensors

1
Department of Sports Science, Japan Institute of Sports Sciences, 3-15-1 Nishigeoka, Kita-ku, Tokyo 115-0056, Japan
2
Faculty of Sport Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama 359-1192, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M.N. Passaro
Received: 5 February 2016 / Revised: 10 March 2016 / Accepted: 21 March 2016 / Published: 2 April 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [2049 KB, uploaded 2 April 2016]   |  

Abstract

This study aims to develop and validate an automated system for identifying skating-style cross-country subtechniques using inertial sensors. In the first experiment, the performance of a male cross-country skier was used to develop an automated identification system. In the second, eight male and seven female college cross-country skiers participated to validate the developed identification system. Each subject wore inertial sensors on both wrists and both roller skis, and a small video camera on a backpack. All subjects skied through a 3450 m roller ski course using a skating style at their maximum speed. The adopted subtechniques were identified by the automated method based on the data obtained from the sensors, as well as by visual observations from a video recording of the same ski run. The system correctly identified 6418 subtechniques from a total of 6768 cycles, which indicates an accuracy of 94.8%. The precisions of the automatic system for identifying the V1R, V1L, V2R, V2L, V2AR, and V2AL subtechniques were 87.6%, 87.0%, 97.5%, 97.8%, 92.1%, and 92.0%, respectively. Most incorrect identification cases occurred during a subtechnique identification that included a transition and turn event. Identification accuracy can be improved by separately identifying transition and turn events. This system could be used to evaluate each skier’s subtechniques in course conditions. View Full-Text
Keywords: cross-country skiing; accelerometer; gyroscope cross-country skiing; accelerometer; gyroscope
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Sakurai, Y.; Fujita, Z.; Ishige, Y. Automatic Identification of Subtechniques in Skating-Style Roller Skiing Using Inertial Sensors. Sensors 2016, 16, 473.

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