Table 2.
Mean ± standard deviations of the root mean square error (RMSE), normalised RMSE (nRMSE), and correlation coefficient (r) for the pelvic orientation (tilt, obliquity, and rotation) between IMU- and OMC-based measurements at four different running speeds. The number of participants (N) at each running speed varies based on trial availability.
| Relative Target Speed | |||||
|---|---|---|---|---|---|
| Joint Angle | Variable | 70% (N = 19) | 80% (N = 19) | 90% (N = 18) | 100% (N = 19) |
| Pelvic tilt | RMSE (°) | 4.31 ± 2.50 | 4.32 ± 2.75 | 4.59 ± 2.51 | 4.55 ± 2.93 |
| nRMSE (%) | 56.10 ± 33.95 | 55.15 ± 38.50 | 58.30 ± 39.96 | 55.97 ± 46.44 | |
| r | 0.55 ± 0.38 | 0.49 ± 0.43 | 0.44 ± 0.49 | 0.54 ± 0.38 | |
| Pelvic obliquity | RMSE (°) | 4.29 ± 1.30 | 4.45 ± 1.50 | 4.75 ± 1.60 | 4.62 ± 1.38 |
| nRMSE (%) | 28.43 ± 8.44 | 29.33 ± 10.39 | 30.86 ± 10.67 | 31.34 ± 10.88 | |
| r | 0.83 ± 0.26 | 0.81 ± 0.30 | 0.75 ± 0.33 | 0.67 ± 0.35 | |
| Pelvic rotation | RMSE (°) | 6.84 ± 4.09 | 7.37 ± 4.37 | 7.77 ± 4.64 | 6.47 ± 2.93 |
| nRMSE (%) | 39.46 ± 31.10 | 38.41 ± 37.77 | 34.16 ± 34.34 | 28.20 ± 23.97 | |
| r | 0.79 ± 0.33 | 0.80 ± 0.30 | 0.85 ± 0.25 | 0.89 ± 0.13 | |