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Analysis of sit-ski alpine skiing trajectories based on an inverted pendulum model
Xu Zhiyi1, Lu Jie1, Xu Qinghua2
1School of Physical Education, Jimei University, Xiamen, Fujian, China.
Scientific Reports
|December 4, 2025
Summary
Elite sit-ski athletes
Area of Science:
- Biomechanics
- Sports Science
- Alpine Skiing
Background:
- Sit-ski alpine skiing involves complex turning dynamics.
- Optimizing performance requires understanding trajectory parameters.
Purpose of the Study:
- To analyze sit-ski alpine skiing trajectories during gate turns.
- To validate an inverted pendulum model for performance optimization.
Main Methods:
- Utilized an advanced kinematic system with inertial sensors and drone video analysis.
- Collected data from 11 elite sit-ski athletes during 33 gate turns.
- Employed an inverted pendulum model for trajectory simulation.
Main Results:
- Identified significant correlations between skiing time, minimum distance, and lateral distance.
- The inverted pendulum model showed strong consistency with actual skiing time (ICC=0.85).
- Optimizing turning radius, speed, and distance was found to reduce skiing time.
Conclusions:
- The inverted pendulum model effectively simulates sit-ski alpine skiing trajectories.
- Model validation supports its use for individualizing sit-ski performance optimization.
- Balancing kinematic parameters is key to enhancing sit-ski racing times.
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