Evaluation of 3D Markerless Motion Capture System Accuracy during Skate Skiing on a Treadmill

In this study, we developed a deep learning-based 3D markerless motion capture system for skate skiing on a treadmill and evaluated its accuracy against marker-based motion capture during G1 and G3 skating techniques. Participants performed roller skiing trials on a skiing treadmill. Trials were rec...

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Bibliographic Details
Published in:Bioengineering (Basel) 2024-01, Vol.11 (2), p.136
Main Authors: Torvinen, Petra, Ruotsalainen, Keijo S, Zhao, Shuang, Cronin, Neil, Ohtonen, Olli, Linnamo, Vesa
Format: Article
Language:English
Subjects:
Accuracy
Algorithms
artificial intelligence
Athletes
Biomechanics
Camcorders
Cameras
Cross country skiing
Deep learning
Fitness equipment
Kinematics
Laboratories
markerless motion capture
Medical research
Medicine, Experimental
Methods
motion analysis
Motion capture
Running
Skating
Skis and skiing
Three dimensional motion
treadmill skiing
Treadmills
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Summary:In this study, we developed a deep learning-based 3D markerless motion capture system for skate skiing on a treadmill and evaluated its accuracy against marker-based motion capture during G1 and G3 skating techniques. Participants performed roller skiing trials on a skiing treadmill. Trials were recorded with two synchronized video cameras (100 Hz). We then trained a custom model using DeepLabCut, and the skiing movements were analyzed using both DeepLabCut-based markerless motion capture and marker-based motion capture systems. We statistically compared joint centers and joint vector angles between the methods. The results demonstrated a high level of agreement for joint vector angles, with mean differences ranging from -2.47° to 3.69°. For joint center positions and toe placements, mean differences ranged from 24.0 to 40.8 mm. This level of accuracy suggests that our markerless approach could be useful as a skiing coaching tool. The method presents interesting opportunities for capturing and extracting value from large amounts of data without the need for markers attached to the skier and expensive cameras.
ISSN:2306-5354
2306-5354
DOI:10.3390/bioengineering11020136