Table 3.
Intermittent contraction series with delayed tracking error correction
| Intermittent Contractions–Delayed Feedback |
||||
|---|---|---|---|---|
| FDI |
VL |
|||
| First contraction | Last contraction | First contraction | Last contraction | |
| Contraction | 1 | 14 | 1 | 10 |
| Excitation at 50% MVC, %max | 22.4 | 82.0 | 45.7 | 80.9 |
| Excitation at 20% MVC at onset, %max | 9.4 | 35.9 | 29.7 | 49.6 |
| Excitation at 20% MVC at end, %max | 5.4 | 46.9 | 23.9 | 53.5 |
| No. of active MUs at 50% MVC | 102 | 120 | 433 | 579 |
| No. of active MUs at 20% MVC at onset | 65 | 113 | 344 | 460 |
| No. of active MUs at 20% MVC at end | 45 | 117 | (208) 227 | 483 |
| No. of MUs recruited | ||||
| 0–10% MVC | 31 | 33 | 19 | 19 |
| 10–20% MVC | 29 | 45 | 76 | 79 |
| 20–30% MVC | 17 | 27 | 149 | 187 |
| 30–40% MVC | 12 | 9 | 104 | 173 |
| 40–50% MVC | 13 | 6 | 85 | 121 |
| Average MU firing rate at 20% MVC, pps | 15.0 (11.5–18.0) | 19.1 (8.2–23.7) | 13.8 (8.2–20.8) | 16.5 (7.6–23.1) |
| Force CV at 20% MVC, % | 1.9 | 2.4 | 0.6 | 0.8 |
| Normalized twitch at 20% MVC at onset | 1 | 0.64 | 1 | 0.7 |
| Normalized twitch at 20% MVC at end | 1.21 | 0.52 | 1.08 | 0.7 |
Data are results of the simulations of the series of repeated intermittent contractions for the FDI and VL muscles with delayed tracking error correction.