Table 1.
Mean (s.d.) calibration gains β, root-mean squared (RMS) errors and coefficients of determination R2 obtained via calibration performed on shear wave speed and tendon stress data from isometric trials. There were no significant effects of knee flexion angle, ankle plantarflexion angle or loading rate on estimates of the gain β.
| Knee, deg | Ankle, deg | Rate, Hz | β, kPa·s2/m2 | RMS Error, MPa | R2 |
|---|---|---|---|---|---|
| 20 | −10 | 0.50 | 8.0 (3.0) | 1.7 (1.3) | 0.98 (0.02) |
| 20 | 0 | 0.50 | 7.7 (2.4) | 1.0 (0.6) | 0.99 (0.02) |
| 20 | 10 | 0.50 | 7.6 (2.1) | 0.8 (0.5) | 0.98 (0.01) |
| 90 | −10 | 0.50 | 7.6 (4.3) | 1.1 (0.6) | 0.99 (0.01) |
| 90 | 0 | 0.50 | 6.8 (2.5) | 1.0 (0.6) | 0.99 (0.01) |
| 90 | 10 | 0.50 | 7.7 (2.8) | 0.7 (0.3) | 0.99 (0.01) |
| 20 | 0 | 0.25 | 7.3 (2.4) | 0.9 (0.6) | 0.99 (0.02) |
| 20 | 0 | 1.00 | 7.4 (2.5) | 1.0 (0.5) | 0.98 (0.02) |