Concurrent Validity of Markerless Motion Capture for Occupational Lifting: Kinematics and Ergonomic Risk Assessment
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Zhang, M
Nieuwenhuys, A
Boocock, M
Zhang, Y
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Elsevier BV
Abstract
Markerless motion capture has the potential to enhance ergonomic risk assessment, but evidence remains limited for occupational manual handling tasks of increasing complexity. This study compared a multi-view system (OpenCap) and a monocular system (MediaPipe) against a marker-based reference system (Vicon) for lifting kinematics. Outcomes were assessed using the Rapid Entire Body Assessment (REBA) risk assessment tool. Twenty healthy participants performed three two-handed lifting tasks of increasing complexity under controlled laboratory conditions. Errors increased by 15–30% from symmetrical to asymmetric multi-planar tasks, with both systems demonstrating lower error in the sagittal plane (RMSE = 9.9–31.2°) than in the frontal and transverse planes. Both systems were reliable for symmetrical lifting, including high REBA agreement, but validity declined for tasks involving trunk rotation and walking. MediaPipe showed lower error for trunk and proximal joints, whereas OpenCap performed better for distal kinematics, informing practical system selection.
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Manual handling, Markerless motion capture, Work-related musculoskeletal disorders, 4201 Allied Health and Rehabilitation Science, 42 Health Sciences, 4207 Sports Science and Exercise, 1106 Human Movement and Sports Sciences, 1116 Medical Physiology, 1203 Design Practice and Management, Human Factors, 3505 Human resources and industrial relations, 5201 Applied and developmental psychology
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Applied Ergonomics, ISSN: 0003-6870 (Print); 1872-9126 (Online), Elsevier BV, 138, 104866-. doi: 10.1016/j.apergo.2026.104866
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Creative Commons Attribution CC BY 4.0
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Except where otherwise noted, this item's license is described as Creative Commons Attribution CC BY 4.0