Fig. 3: Shoulder angle estimation during functional movement.

a Confusion matrix. b Overall angle error in Root Mean Squared Error. Xsens represents joint angle output from its proprietary sensor fusion algorithm. LSTM stands for Long Short-Term Memory, DCNN stands for Dilated Convolutional Neural Network, and AIL-KE stands for Activity-In-the-Loop Kinematics Estimator. c Plot of motion changes (in Motion Magnitude) and angle errors for different approaches. d Angle error for different activities. e Root Mean-Square Errors for IMU-based shoulder joint angles over 10 minutes. The fitted lines (dotted lines) represent linear fits across 10 minutes of the trial.