Muscle and Joint Reaction Force Characteristics During Snatch Lift Based on Multi-Source Heterogeneous Data Fusion

This study biomechanically investigates the snatch in weightlifting. Twenty-three youth weightlifters aged 15–18 performed snatches at 70%, 80%, and 90% of 1RM, with inertial motion capture and EMG data collected. Using OpenSim, deep muscle forces and joint loads were inversely calculated. Results showed that muscle activation, force output, and joint reaction forces increased significantly with load. The findings support technical evaluation, training optimization, and personalized injury prevention.