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Letter

Application of Inertial Motion Unit-Based Kinematics to Assess the Effect of Boot Modifications on Ski Jump Landings—A Methodological Study

1
Institute of Sport Science, University of Hildesheim, 31141 Hildesheim, Germany
2
Department of Industrial Engineering, University of Padova, 35131 Padova, Italy
3
Faculty of Sport, Lljubljana University, 1000 Ljubljana, Yugoslavia
4
Sport Sciences, Aalborg University, 9000 Aalborg, Denmark
5
Institute of Biomechanics and Orthopaedics, German Sport University, 50933 Cologne, Germany
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(13), 3805; https://doi.org/10.3390/s20133805
Received: 4 June 2020 / Revised: 1 July 2020 / Accepted: 4 July 2020 / Published: 7 July 2020
(This article belongs to the Section Wearables)
Biomechanical studies of winter sports are challenging due to environmental conditions which cannot be mimicked in a laboratory. In this study, a methodological approach was developed merging 2D video recordings with sensor-based motion capture to investigate ski jump landings. A reference measurement was carried out in a laboratory, and subsequently, the method was exemplified in a field study by assessing the effect of a ski boot modification on landing kinematics. Landings of four expert skiers were filmed under field conditions in the jump plane, and full body kinematics were measured with an inertial motion unit (IMU) -based motion capture suit. This exemplary study revealed that the combination of video and IMU data is viable. However, only one skier was able to make use of the added boot flexibility, likely due to an extended training time with the modified boot. In this case, maximum knee flexion changed by 36° and maximum ankle flexion by 13°, whereas the other three skiers changed only marginally. The results confirm that 2D video merged with IMU data are suitable for jump analyses in winter sports, and that the modified boot will allow for alterations in landing technique provided that enough time for training is given. View Full-Text
Keywords: skiing; kinematics; motion analysis; footwear; measurement systems skiing; kinematics; motion analysis; footwear; measurement systems
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MDPI and ACS Style

Kurpiers, N.; Petrone, N.; Supej, M.; Wisser, A.; Hansen, J.; Kersting, U.G. Application of Inertial Motion Unit-Based Kinematics to Assess the Effect of Boot Modifications on Ski Jump Landings—A Methodological Study. Sensors 2020, 20, 3805. https://doi.org/10.3390/s20133805

AMA Style

Kurpiers N, Petrone N, Supej M, Wisser A, Hansen J, Kersting UG. Application of Inertial Motion Unit-Based Kinematics to Assess the Effect of Boot Modifications on Ski Jump Landings—A Methodological Study. Sensors. 2020; 20(13):3805. https://doi.org/10.3390/s20133805

Chicago/Turabian Style

Kurpiers, Nicolas, Nicola Petrone, Matej Supej, Anna Wisser, Jakob Hansen, and Uwe G. Kersting 2020. "Application of Inertial Motion Unit-Based Kinematics to Assess the Effect of Boot Modifications on Ski Jump Landings—A Methodological Study" Sensors 20, no. 13: 3805. https://doi.org/10.3390/s20133805

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