Table 2. Discrete variables calculated from the force-measuring treadmill data and predicted by the Quantile Regression Forest (QRF) or Linear Regression (LR) models for the testing subset of data.
Mean ± SD peak vertical ground reaction force (vGRF), vertical impulse, and contact time for the nine participants in the testing subset of data.
| Peak vGRF [BW] | Speed [m/s] | Observed | QRF Prediction | LR Prediction |
|---|---|---|---|---|
| Females | 3.8 | 2.66 ± 0.18 | 2.78 ± 0.13 | 2.75 ± 0.05 |
| (n = 5) | 4.8 | 2.86 ± 0.15 | 2.88 ± 0.09 | 2.86 ± 0.05 |
| Males | 3.8 | 2.98 ± 0.08 | 2.98 ± 0.20 | 2.94 ± 0.13 |
| (n = 4) | 4.1 | 3.07 ± 0.10 | 3.02 ± 0.16 | 3.00 ± 0.15 |
| 5.4 | 3.30 ± 0.20 | 3.14 ± 0.10 | 3.18 ± 0.16 | |
| Vertical Impulse [BW*s] | ||||
| Females | 3.8 | 0.33 ± 0.02 | 0.33 ± 0.02 | 0.33 ± 0.02 |
| (n = 5) | 4.8 | 0.31 ± 0.02 | 0.31 ± 0.01 | 0.31 ± 0.02 |
| Males | 3.8 | 0.35 ± 0.01 | 0.35 ± 0.01 | 0.35 ± 0.01 |
| (n = 4) | 4.1 | 0.35 ± 0.01 | 0.35 ± 0.01 | 0.35 ± 0.01 |
| 5.4 | 0.33 ± 0.01 | 0.33 ± 0.01 | 0.33 ± 0.01 | |
| Contact Time [s] | ||||
| Females | 3.8 | 0.204 ± 0.014 | 0.198 ± 0.004 | 0.198 ± 0.008 |
| (n = 5) | 4.8 | 0.177 ± 0.012 | 0.167 ± 0.005 | 0.174 ± 0.008 |
| Males | 3.8 | 0.204 ± 0.009 | 0.203 ± 0.006 | 0.204 ± 0.005 |
| (n = 4) | 4.1 | 0.195 ± 0.007 | 0.201 ± 0.005 | 0.198 ± 0.005 |
| 5.4 | 0.165 ± 0.007 | 0.173 ± 0.010 | 0.172 ± 0.002 |