2023

BioMedical Engineering OnLine

Key transition technology of ski jumping based on inertial motion unit, kinematics and dynamics

Jinglun Yu, Xinying Ma, Shuo Qi, Zhiqiang Liang, Zhen Wei, Qi Li, Weiguang Ni, Shutao Wei, Shengnian Zhang

Key Laboratory of Exercise and Health Sciences of Ministry of Education, Shanghai University of Sport, Shanghai

Keywords

Moticon Marketing Moticon Marketing 100% 8 Q95 ski jumping, technology, kinematics, dynamics, imu, measurement systems ski jumping, technology, kinematics, dynamics, imu, measurement systems Turn on screen reader support To enable screen reader support, press Ctrl+Alt+Z To learn about keyboard shortcuts, press Ctrl+slash

Abstract

Background The development and innovation of biomechanical measurement methods provide a solution to the problems in ski jumping research. At present, research on ski jumping mostly focuses on the local technical characteristics of different phases, but studies on the technology transition process are less. Objectives This study aims to evaluate a measurement system (i.e. the merging of 2D video recording, inertial measurement unit and wireless pressure insole) that can capture a wide range of sport performance and focus on the key transition technical characteristics. Methods The application validity of the Xsens motion capture system in ski jumping was verified under field conditions by comparing the lower limb joint angles of eight professional ski jumpers during the takeoff phase collected by different motion capture systems (Xsens and Simi high-speed camera). Subsequently, the key transition technical characteristics of eight ski jumpers were captured on the basis of the aforementioned measurement system. Results Validation results indicated that the joint angle point-by-point curve during the takeoff phase was highly correlated and had excellent agreement (0.966 ≤ r ≤ 0.998, P < 0.001). Joint root-mean-square error (RMSE) differences between model calculations were 5.967° for hip, 6.856° for knee and 4.009° for ankle. Conclusions Compared with 2D video recording, the Xsens system shows excellent agreement to ski jumping. Furthermore, the established measurement system can effectively capture the key transition technical characteristics of athletes, particularly in the dynamic changes of straight turn into arc in inrun, the adjustment of body posture and ski movement during early flight and landing preparation.

Moticon's Summary

In their investigation the authors aimed to validate a combination of motion capture systems and wearables for an application in ski jumping as well as to analyze technical characteristics in different stages of a ski jump. Among other sensors Moticon sensor insoles were used to obtain foot dynamics. The authors found their measurement system to be appropriate for usage in ski jumping. Furthermore, they successfully leveraged the measurement system to derive insight into technical characteristics of ski jumping.

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