TABLE 2.
Effect of speed on EMG burst durations and amplitudes in the three conditions.
| Burst duration |
Burst amplitude |
||||||||
| Slope value | Intact2 | Spinal2 | Slope value | Intact2 | Spinal2 | ||||
| LG (P = 0.003) | Intact4 | −0.052 ± 0.013 | P = 0.268 | P = 0.029* | LG (P = 0.51) | Intact4 | 6.176 ± 2.304 | ||
| Intact2 | −0.061 ± 0.015 | P = 0.002* | Intact2 | 8.144 ± 3.843 | |||||
| Spinal2 | −0.030 ± 0.014 | Spinal2 | 6.389 ± 4.682 | ||||||
| MG (P = 0.005) | Intact4 | −0.058 ± 0.015 | P = 0.268 | P = 0.022* | MG (P = 0.017) | Intact4 | 5.108 ± 2.027 | P = 0.013* | P = 0.497 |
| Intact2 | −0.066 ± 0.012 | P = 0.017* | Intact2 | 9.183 ± 2.619 | P = 0.050* | ||||
| Spinal2 | −0.036 ± 0.016 | Spinal2 | 4.130 ± 4.067 | ||||||
| SOL (P = 0.002) | Intact4 | −0.051 ± 0.007 | P = 0.365 | P = 0.010* | SOL (P = 0.69) | Intact4 | 2.150 ± 1.536 | ||
| Intact2 | −0.047 ± 0.011 | P = 0.016* | Intact2 | 1.188 ± 2.932 | |||||
| Spinal2 | −0.030 ± 0.012 | Spinal2 | 1.969 ± 1.942 | ||||||
| VL (P = 0.0006) | Intact4 | −0.057 ± 0.013 | P = 0.073 | P = 0.001* | VL (P = 0.50) | Intact4 | 7.515 ± 2.110 | P = 0.013* | P = 0.497 |
| Intact2 | −0.046 ± 0.013 | P = 0.024* | Intact2 | 5.812 ± 1.965 | P = 0.050* | ||||
| Spinal2 | −0.029 ± 0.014 | Spinal2 | 9.775 ± 12.230 | ||||||
| BFA (P = 0.050) | Intact4 | −0.053 ± 0.014 | P = 0.481 | P = 0.038* | BFA (P = 0.003) | Intact4 | 8.605 ± 3.538 | P = 0.021* | P = 0.016* |
| Intact2 | −0.046 ± 0.013 | P = 0.047* | Intact2 | 3.352 ± 2.726 | P = 0.240 | ||||
| Spinal2 | −0.031 ± 0.014 | Spinal2 | 1.948 ± 1.913 | ||||||
| IP (P = 0.012) | Intact4 | −0.013 ± 0.008 | P = 0.035* | P = 0.025* | IP (P = 0.32) | Intact4 | 3.373 ± 1.367 | ||
| Intact2 | −0.003 ± 0.005 | P = 0.207 | Intact2 | 5.455 ± 3.699 | |||||
| Spinal2 | −0.003 ± 0.007 | Spinal2 | 7.529 ± 7.874 | ||||||
| SRT (P = 0.108) | Intact4 | −0.010 ± 0.007 | SRT (P = 0.33) | Intact4 | 1.413 ± 0.975 | ||||
| Intact2 | −0.011 ± 0.008 | Intact2 | 3.618 ± 3.742 | ||||||
| Spinal2 | −0.002 ± 0.005 | Spinal2 | 3.811 ± 4.008 | ||||||
| ST (P = 0.050) | Intact4 | −0.011 ± 0.011 | P = 0.584 | P = 0.023* | ST (P = 0.018) | Intact4 | 5.132 ± 2.134 | P = 0.544 | P = 0.038* |
| Intact2 | −0.008 ± 0.010 | P = 0.095 | Intact2 | 4.027 ± 2.667 | P = 0.023* | ||||
| Spinal2 | −0.001 ± 0.004 | Spinal2 | 9.619 ± 3.613 | ||||||
| BFP (P = 0.042) | Intact4 | −0.013 ± 0.012 | P = 0.230 | P = 0.041* | BFP (P = 0.11) | Intact4 | 4.139 ± 3.023 | ||
| Intact2 | −0.005 ± 0.008 | P = 0.074 | Intact2 | 7.420 ± 3.875 | |||||
| Spinal2 | −0.001 ± 0.002 | Spinal2 | 12.818 ± 9.303 | ||||||
The table shows mean slope values ± standard deviations obtained by performing a linear regression analysis between burst durations or amplitudes as a function of speed. In the brackets next to the muscle is the P value of the main effect of condition (one-factor ANOVA). If a significant main effect was found, we performed pairwise comparisons and the P values are indicated comparing the three conditions.
LG, lateral gastrocnemius; MG, medial gastrocnemius; SOL, soleus; VL, vastus lateralis; BFA, biceps femoris anterior; IP, iliopsoas; SRT, anterior sartorius; ST, semitendinosus; BFP, biceps femoris posterior.
An asterisk indicates a significant difference of the pairwise comparison at P < 0.05.