Table 2.
Effect of contraction type on maximal voluntary torque, plantarflexor EMG activity, amplitudes of Soleus (SOL) and medial gastrocnemius (MG) evoked potentials and coactivation
| Lengthening | Isometric | Shortening | ||
|---|---|---|---|---|
| Experiment A | Torque (N.m) | 109.6 ± 6.3 | 105.9 ± 6.2 | 85.7 ± 6.9* |
| Sol | ||||
| Passive | ||||
| Mmax (mV) | 8.5 ± 0.9 | 8.6 ± 0.9 | 8.7 ± 0.9 | |
| MVC | ||||
| Mmax (mV) | 12.8 ± 1.0 | 12.6 ± 0.9 | 12.8 ± 1.0 | |
| RMS/Mmax (a.u.) | 0.035 ± 0.002 | 0.036 ± 0.002 | 0.036 ± 0.004 | |
| MG | ||||
| Passive | ||||
| Mmax (mV) | 7.2 ± 1.2 | 7.0 ± 1.2 | 7.3 ± 1.2 | |
| MVC | ||||
| Mmax (mV) | 9.1 ± 1.2 | 9.5 ± 1.3 | 9.2 ± 1.3 | |
| RMS/Mmax (a.u.) | 0.048 ± 0.007 | 0.044 ± 0.006 | 0.040 ± 0.006 | |
| Coactivation (%) | 10.82 ± 2.63 | 11.12 ± 2.44 | 10.44 ± 1.84 | |
| Experiment B | Torque (N.m) | 113.1 ± 8.5 | 110.8 ± 7.5 | 89.75 ± 7.4* |
| Sol | ||||
| Passive | ||||
| Mmax (mV) | 8.2 ± 0.9 | 8.4 ± 0.9 | 8.3 ± 0.8 | |
| MHmax/Mmax (a.u.) | 0.18 ± 0.05 | 0.15 ± 0.05 | 0.13 ± 0.05 | |
| MVC | ||||
| Mmax (mV) | 11.7 ± 0.9 | 11.4 ± 1.0 | 11.3 ± 1.0 | |
| RMS/Mmax (a.u.) | 0.041 ± 0.002 | 0.044 ± 0.003 | 0.041 ± 0.003 | |
| MHmax/Mmax (a.u.) | 0.21 ± 0.06 | 0.19 ± 0.05 | 0.19 ± 0.03 | |
| MG | ||||
| Passive | ||||
| Mmax (mV) | 7.1 ± 1.2 | 6.6 ± 1.1 | 6.9 ± 1.2 | |
| MHmax/Mmax (a.u.) | 0.36 ± 0.08 | 0.36 ± 0.09 | 0.30 ± 0.08 | |
| MVC | ||||
| Mmax (mV) | 9.4 ± 0.9 | 10.7 ± 1.1 | 9.7 ± 0.9 | |
| RMS/Mmax (a.u.) | 0.044 ± 0.006 | 0.042 ± 0.008 | 0.038 ± 0.008 | |
| MHmax/Mmax (a.u.) | 0.42 ± 0.07 | 0.37 ± 0.08 | 0.36 ± 0.08 | |
| Coactivation (%) | 13.72 ± 1.26 | 14.99 ± 1.98 | 13.74 ± 1.63 |
Data are mean ± SEM (n = 12).
*
Significant at P < 0.001: Shortening vs. Isometric and Lengthening