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Sports biomechanics infomation acquisition and analysis based on Miniature Inertial Measurement

To fully evaluate the quality of movement the athlete performed, sports biomechanics information acquisition and analysis at barycenter is conducted based on Miniature Inertial Measurement Unit. The methods to acquire accurate speed, key point identification and index of redundant movement of the subject are proposed. Key point detection is realized by cascaded logical analysis. Velocity estimation is derived by approximate equation. Gesture Energy index is proposed which provides quantity clue for distinguishing of sports quality based on angular velocity record from Miniature Inertial Measurement Unit corresponding to key point. Experiments of measurements on athletes are done to prove the validation of the methods put forward. The velocity results of approximate equation are comparable to the results of video analysis. Phase identification procedure and Gesture Energy index are also proven to be practicable. The methods could offer some aided information to coaches in daily training.