A272: IMU-Based Multimodal Framework: Effects of Mental Fatigue on Technical Movement Stability in Youth Football Players

Mental fatigue has a potential negative impact on athletes' technical skill stability, yet quantitative assessment and mechanism analysis in youth football contexts remain insufficient. This study aims to establish a multimodal monitoring framework based on inertial measurement units (IMUs) to uncover dynamic variation patterns in sport-specific technical skill stability among youth football players under mental fatigue. Twenty-eight elite male youth players from professional academies (aged 15.8±1.3 years) underwent standardized cognitive loading tasks to induce mental fatigue. A distributed IMU sensing system (7-node configuration, 200Hz sampling rate) synchronously captured 17 kinematic parameters across three core technical skills (dribbling, passing, shooting), integrated with heart rate variability (HRV) and environmental perception data to construct a multimodal dataset. Nonlinear time-series analysis and multiscale feature extraction methods were employed to examine motion stability degeneration patterns under fatigue conditions. The findings revealed significant differential degradation in ankle joint stability (p