Table 2.
Model parameters
| Parameter | Unit | Description | Initial Value | Estimated Value (mean ± 1 s.d.) |
|---|---|---|---|---|
| m | kg | mass (ankle + footplate) | 2 | 1.86 ± 0.42 |
| b | Ns/m | viscosity coefficient | 5 | 1.28 ± 1.08 |
| k | 1/m | stiffness coefficient | 100 | 26.4 ± 15.4 |
| x0 | m | muscle length shift | 0 | -0.0081 ± 0.0023 |
| F0 | N | muscle force shift | -25 | -21.2 ± 9.6 |
|
e1, e2, e3, e4 |
N/Volts | EMG weighting factors | 10000 | 3.5 ± 1.05, 2.0 ± 0.96, 3.1 ± 0.77, 2.6 ± 1.1 (× 105) |
| f | Hz | activation cutoff frequency | 1.5 | 1.28 ± 0.34 |
Model parameters, initial values used for estimation and estimated values (mean and standard deviation of all conditions and subjects).