Validation of a low cost imc system for whole body motion analysis

The objective of this study was to evaluate the accuracy of a commercially available low cost inertial motion capture system (IMC). Four subjects equipped with seventeen inertial measurement units (IMU) performed manual handling of boxes for about 35 minutes. An optoelectronic system was used as a gold standard for the evaluation. Validity of the IMC was assessed by comparing joints angles curves measured by both systems and using a combination of multiple parameters for quantifying time series similarities: the root mean square error (RMSE), Pearson’s correlation coefficient (r) and the delta range of movement (????ROM). For most joints, the RMSE was lower than 4°, r was over 0.98 and ????ROM under 8° which indicated the potential of using this low cost system for tracking human movements.