2024 Volume 3 Pages 77-85
Purpose: This study aimed to validate and assess the reliability of IMUrater, a method for measuring joint angles by placing Inertial Measurement Unit (IMU) sensors on the measurer's body.
Methods: Sixteen healthy adults were included, and the validity and reliability of IMUrater were compared with an optical motion capture (OMC) system using cameras for motion analysis.
Results: The coefficient of multiple correlation (CMC) and root mean square error (RMSE) between the IMUrater and the OMC-based method were 0.93 and 31.20 degrees, respectively. Within sessions, IMUrater showed a CMC of 0.95, a RMSE of 19.40 degrees, and an intraclass correlation coefficient (ICC) of 0.92, while between sessions, the values were 0.85, 35.74 degrees, and 0.19, respectively.
Conclusion: IMUrater demonstrated high validity in relative joint angles. Within-session reliability was high, with strong agreement in time series waveform data indicated by CMC. However, between-session reliability showed lower agreement, with substantial discrepancies observed in absolute angle measurements.
