Table 1.
Results of muscle synergy extraction.
| Subject ID | NVAF | NCD | NAD | CD of force reconstruction with training data | CD of force reconstruction with test data |
|---|---|---|---|---|---|
| A | 4 | 5 | 6 | 0.727 | 0.788 |
| B | 3 | 4 | 5 | 0.814 | 0.690 |
| C | 3 | 3 | 4 | 0.877 | 0.805 |
| D | 2 | 3 | 4 | 0.836 | 0.832 |
| E | 4 | 5 | 6 | 0.723 | 0.818 |
| F | 4 | 5 | 6 | 0.839 | 0.849 |
| G | 3 | 5 | 6 | 0.767 | 0.662 |
| H | 4 | 5 | 6 | 0.795 | 0.768 |
| I | 4 | 5 | 6 | 0.875 | 0.885 |
| J | 4 | 5 | 6 | 0.862 | 0.732 |
| Average ± SD | 3.50 ± 0.71 | 4.50 ± 0.85 | 5.50 ± 0.85 | 0.811 ± 0.06 | 0.783 ± 0.07 |
The NVAF and NCD denote the number of muscle synergies extracted by VAF and CD criteria, respectively. The NAD denotes the number of muscle synergies that is one more than NCD or NVAF(the larger one). The CD of force reconstruction is calculated by using the training data (EMG and force data in the isometric force production by actual force task) and the test data (EMG and force data in the isometric force production by estimated force task).