Table 1.
Control potentials and long-interval inhibition during submaximal maintained-EMG contractions prior to fatigue
| Mmax | Conditioned potentials | Unconditioned potentials | Cond/Uncond ratio | |||||
|---|---|---|---|---|---|---|---|---|
| Amplitude (mV) | Area (mV s) | Amplitude (mV) | Area (mV s) | Amplitude (mV) | Area (mV s) | Amplitude (%) | Area (%) | |
| Weak | ||||||||
| MEP | 23.6 ± 5.5 | 0.123 ± 0.026 | 4.3 ± 1.4 | 0.019 ± 0.007 | 13.9 ± 5.0* | 0.086 ± 0.029* | 32.1 ± 11.3 | 22.4 ± 6.8 |
| CMEP | 24.3 ± 5.2 | 0.129 ± 0.027 | 4.2 ± 1.3 | 0.017 ± 0.006 | 7.8 ± 4.0 | 0.035 ± 0.020 | 68.4 ± 48.4 | 67.5 ± 57.1 |
| P = 0.379 | P = 0.093 | P = 0.643 | P = 0.227 | P = 0.007 | P = 0.001 | P = 0.071 | P = 0.051 | |
| Strong | ||||||||
| MEP | 24.3 ± 6.3 | 0.129 ± 0.030 | 11.2 ± 2.8 | 0.063 ± 0.020 | 15.8 ± 4.8 | 0.101 ± 0.029* | 71.9 ± 8.5 | 62.8 ± 14.8 |
| CMEP | 24.6 ± 5.6 | 0.128 ± 0.031 | 11.4 ± 2.7 | 0.049 ± 0.015 | 15.2 ± 6.4 | 0.080 ± 0.040 | 81.1 ± 22.0 | 69.9 ± 26.2 |
| P = 0.465 | P = 0.182 | P = 0.843 | P = 0.061 | P = 0.309 | P = 0.014 | P = 0.252 | P = 0.586 | |
Data are mean values (± SD) of the four protocols. Long-interval inhibition was calculated for each subject as the ratio (expressed as a percentage) between the mean area of conditioned responses and the mean area of unconditioned responses. Asterisks (*) denote a difference between the weak MEP and CMEP or the strong MEP and CMEP (P values < 0.05 are indicated by bold text).