Table 1.
Mean ± standard deviations of the root mean square error (RMSE), normalised RMSE (nRMSE), and correlation coefficient (r) for sagittal plane hip, knee, and ankle joint angles 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) |
| Hip flexion | RMSE (°) | 6.76 ± 3.18 | 6.95 ± 3.33 | 7.31 ± 3.03 | 7.83 ± 3.43 |
| nRMSE (%) | 7.72 ± 3.24 | 7.54 ± 3.34 | 7.64 ± 3.00 | 8.18 ± 3.50 | |
| r | 0.99 ± 0.01 | 0.99 ± 0.01 | 0.99 ± 0.01 | 0.99 ± 0.01 | |
| Knee flexion | RMSE (°) | 6.20 ± 2.10 | 5.96 ± 1.82 | 6.30 ± 1.85 | 6.02 ± 1.68 |
| nRMSE (%) | 5.69 ± 1.95 | 5.38 ± 1.65 | 5.56 ± 1.66 | 5.27 ± 1.51 | |
| r | 0.99 ± 0.01 | 0.99 ± 0.00 | 0.99 ± 0.00 | 0.99 ± 0.00 | |
| Ankle flexion | RMSE (°) | 4.44 ± 1.89 | 4.64 ± 2.28 | 5.33 ± 2.33 | 5.33 ± 2.37 |
| nRMSE (%) | 8.45 ± 3.87 | 8.45 ± 3.79 | 9.72 ± 4.09 | 10.37 ± 4.83 | |
| r | 0.97 ± 0.03 | 0.98 ± 0.02 | 0.97 ± 0.03 | 0.96 ± 0.03 | |