Feature extraction of performance variables in elite half-pipe snowboarding using body mounted inertial sensors

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Title Feature extraction of performance variables in elite half-pipe snowboarding using body mounted inertial sensors
Author Harding, Jason; Small, James William; James, Daniel Arthur
Publication Title BioMEMS and Nanotechnology III
Editor Dan V. Nicolau; Derek Abbott; Kourosh Kalantar-Zadeh; Tiziana Di Matteo; Sergey M. Bezrukov
Year Published 2008
Place of publication US
Publisher SPIE
Abstract Recent analysis of elite-level half-pipe snowboard competition has revealed a number of sport specific key performance variables (KPV's) that correlate well to score. Information on these variables is difficult to acquire and analyse, relying on collection and labour intensive manual post processing of video data. This paper presents the use of inertial sensors as a user-friendly alternative and subsequently implements signal processing routines to ultimately provide automated, sport specific feedback to coaches and athletes. The author has recently shown that the key performance variables (KPV's) of total air-time (TAT) and average degree of rotation (ADR) achieved during elite half-pipe snowboarding competition show strong correlation with an athlete's subjectively judged score. Utilising Micro-Electrochemical System (MEMS) sensors (tri-axial accelerometers) this paper demonstrates that air-time (AT) achieved during half-pipe snowboarding can be detected and calculated accurately using basic signal processing techniques. Characterisation of the variations in aerial acrobatic manoeuvres and the associated calculation of exact degree of rotation (DR) achieved is a likely extension of this research. The technique developed used a two-pass method to detect locations of half-pipe snowboard runs using power density in the frequency domain and subsequently utilises a threshold based search algorithm in the time domain to calculate air-times associated with individual aerial acrobatic manoeuvres. This technique correctly identified the air-times of 100 percent of aerial acrobatic manoeuvres within each half-pipe snowboarding run (n = 92 aerial acrobatic manoeuvres from 4 subjects) and displayed a very strong correlation with a video based reference standard for air-time calculation (r = 0.78 ± 0.08; p value < 0.0001; SEE = 0.08 ×/÷ 1.16; mean bias = -0.03 ± 0.02s) (value ± or ×/÷ 95% CL).
Peer Reviewed Yes
Published Yes
Publisher URI http://spie.org/
Alternative URI http://dx.doi.org/10.1117/12.759259
Copyright Statement Copyright 2008 Society of Photo-Optical Instrumentation Engineers. This paper was published in SPIE volume 6799: Modelling and THZ Technology and is made available as an electronic reprint with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
ISBN 1605-7422
Conference name BioMEMS and Nanotechnology III
Location Canberra
Date From 2007-12-05
Date To 2007-12-07
URI http://hdl.handle.net/10072/24604
Date Accessioned 2009-05-05
Language en_AU
Research Centre Griffith Institute For Tourism
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Biomedical Engineering
Publication Type Conference Publications (Full Written Paper - Refereed)
Publication Type Code e1

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