Table 3.
Mean (SE) values of observed covariate factors and BB MEP amplitude
| Observed variable | Low Support | Medium Support | High Support | |||
|---|---|---|---|---|---|---|
| Flexion | Pronation | Flexion | Pronation | Flexion | Pronation | |
| Pre-trigger activity | 0.0415 (0.0010) |
0.0303 (0.0009) |
0.0361 (0.0010) |
0.0254 (0.0008) |
0.0311 (0.0010) |
0.0169 (0.0007) |
| Burst onset interval (s) | 0.1843 (0.0021) |
0.1865 (0.0021) |
0.1851 (0.0022) |
0.1906 (0.0021) |
0.1870 (0.0021) |
0.1866 (0.0021) |
| Stimulus intensity | 1.2557 (0.0042) |
1.2529 (0.0043) |
1.3154 (0.0029) |
1.3176 (0.0032) |
1.3242 (0.0027) |
1.3274 (0.0027) |
| Task ratio | 5.1247 (0.1510) |
8.8021 (0.1969) |
6.3926 (0.2197) |
10.1044 (0.1892) |
6.8140 (0.2430) |
11.0445 (0.2796) |
| MEP amplitude | 0.3954 (0.0086) |
0.2775 (0.0067) |
0.3529 (0.0070) |
0.2804 (0.0076) |
0.3231 (0.0075) |
0.1713 (0.0061) |
Pre-trigger activity is expressed as a proportion of maximum voluntary contraction. Burst onset interval is expressed in seconds. Stimulus intensity is expressed as a proportion of active motor threshold. Task ratio is an expression of EMG burst amplitude relative to baseline EMG amplitude. Raw MEP amplitudes were rescaled between 0 and 1 within each participant