TABLE 3.
Group performance of the model for the prediction of HCF across activities. The values are shown as average (arithmetic mean) ± standard deviation. R 2 is the coefficient of determination, exp. peak is the experimental peak and WN, WS, WF, SU, SD, CD, and CU stand for normal walking, slow walking, fast walking, stair ascent, stair descent, sitting down and standing up, respectively.
| RMSE (%BW) | R 2 | 1st peak of HCF | 2nd peak of HCF | ||||
|---|---|---|---|---|---|---|---|
| Magnitude error (% exp. Peak) | Timing error (% gait cycle) | Magnitude error (% exp. Peak) | Timing error (% gait cycle) | ||||
| Group average | WN | 47.4 ± 6.5 | 0.92 ± 0.04 | 28.0 ± 7.4 | 4.9 ± 6.1 | 23.9 ± 13.4 | 1.3 ± 1.0 |
| WS | 44.0 ± 8.5 | 0.94 ± 0.03 | 14.3 ± 10.9 | 2.3 ± 1.7 | 17.9 ± 7.2 | 1.9 ± 1.6 | |
| WF | 59.8 ± 7.1 | 0.90 ± 0.04 | 35.4 ± 11.0 | 5.7 ± 6.2 | 17.2 ± 11.6 | 1.2 ± 1.1 | |
| SU | 44.2 ± 16.8 | 0.92 ± 0.04 | 7.4 ± 4.9 | 2.1 ± 2.2 | 24.7 ± 14.6 | 2.1 ± 2.2 | |
| SD | 53.3 ± 12.2 | 0.91 ± 0.05 | 14.9 ± 11.3 | 2.0 ± 1.1 | 31.4 ± 17.9 | 0.9 ± 1.0 | |
| CU | 31.8 ± 8.2 | 0.86 ± 0.08 | 11.7 ± 10.3 | 4.7 ± 3.5 | NA | NA | |
| CD | 17.1 ± 5.0 | 0.95 ± 0.03 | 9.4 ± 6.2 | 3.6 ± 4.0 | NA | NA | |