TABLE 3.
Mean ± standard deviation of VAF values for the reconstruction of measured muscle excitations with muscle synergy analysis across both subjects and all calibration trials with four to seven synergies when unmeasured synergy vector weights were assumed to be trial-specific, speed specific, or subject-specific.
| Sub | Variability assumption | Left | Right | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Number of synergies | Number of synergies | ||||||||
| 4 | 5 | 6 | 7 | 4 | 5 | 6 | 7 | ||
| S1 | Trial | 96.5 ± 1.5 | 98.2 ± 0.7 | 99.3 ± 0.3 | 99.7 ± 0.1 | 95.2 ± 2.4 | 96.8 ± 1.8 | 98.6 ± 0.9 | 99.2 ± 0.5 |
| Speed | 91.0 ± 3.6 | 93.7 ± 2.2 | 96.1 ± 1.5 | 97.4 ± 1.1 | 87.7 ± 5.6 | 92.2 ± 3.8 | 94.3 ± 2.5 | 95.5 ± 2.0 | |
| Subject | 89.2 ± 5.6 | 92.1 ± 3.3 | 94.8 ± 2.6 | 96.2 ± 1.6 | 84.4 ± 7.1 | 88.5 ± 3.6 | 92.2 ± 4.4 | 95.1 ± 3.3 | |
| S2 | Trial | 95.3 ± 1.8 | 97.6 ± 1.2 | 98.8 ± 0.6 | 99.5 ± 0.2 | 97.3 ± 1.1 | 98.6 ± 0.5 | 99.3 ± 0.3 | 99.6 ± 0.2 |
| Speed | 89.3 ± 4.1 | 93.2 ± 2.6 | 93.2 ± 2.6 | 97.1 ± 0.9 | 95.3 ± 0.9 | 96.5 ± 0.9 | 97.3 ± 0.7 | 97.9 ± 0.4 | |
| Subject | 87.8 ± 4.5 | 91.3 ± 2.7 | 94.7 ± 1.9 | 96.0 ± 1.7 | 93.1 ± 1.4 | 95.4 ± 0.8 | 96.3 ± 0.7 | 97.1 ± 0.8 | |
Sub. means subject bold represents the minimum number of synergies required for the specific leg to achieve a VAF above 95%.