Three-dimensional Kinematic And Surface Electromyographic Analysis During Activities Of Daily Living In Normal Subjects And Hemiplegic Patients

Objective: Applying the three-dimensional kenematic analysis method with the surface electromyography (sEMG) to study the kinematic characteristics and sEMG features of the normal subjects and hemiplegic patients in activities of daily living (ADL).Methods: we used an Vicon motion capture system and Megawin sEMG system to record the three-dimensional kinematic data and sEMG data of fifteen normal subjects ( the normal group) and ten hemiparetic patients (the hemiplegic group) during performing five ADL tasks. The tasks were reaching up, combing, drinking, touching lateral shoulder, touching back pocket. After managing, we obtained the movement time, the three-dimensional motion angle of the sternoclavicular joint, the acromioclavicular joint, the shoulder joint, the elbow joint, the wrist joint and the root-mean-square (RMS) ratios of the biceps brachii muscle, the triceps brachii muscle, the anterior part of detoid muscle, the median part of detoid muscle, the laterior part of detoid muscle, the serratus anterior muscle, the latissimus dorsi muscle, the upper part of trapezius muscle, the lower part of trapezius muscle. And then, we compared the three-dimensional joint angle, the RMS ratios and movement time between the normal group and the hemiplegc group.Results: Comparing with the normal group, the hemiplegic group had the significant increases in lateral rotation and abduction of the sternoclavicular joint, medial rotation and extension of the acromioclavicular joint, flexion of the elbow joint and the significant decreases in medial roation of the sternoclavicular joint and adduction/abduction, flexion/extension, lateral/medianl roatation of the shoulder joint. Similarly, we found the RMS ratios of the hemiplegic group increased significantly in the triceps brachii, the anterior part of detoid muscle, the median part of detoid muscle, the laterior part of detoid muscle, the serratus anterior muscle and the lower part of trapezius muscle. Additionally, the hemiplegic group showed significantly prolonged movement time.Conclusion: We established a three-dimensional kinematic analysis method of upper extremity based on the Vicon system and proposed a clinical sEMG standardized methods. The results showed that the hemiplegical patients utilized different motor patterns and muscle contraction strategies from healthy subjects to complete the activities of daily living.