Table 2.
Dorsiflexion (TA) contractile properties in controls and patients with DPN
| Muscle Property | Control (n = 12) | DPN (n = 12) | %Difference |
|---|---|---|---|
| MVC, N·m | 34.1 ± 9.5 | 22.3 ± 7.2* | −34.6% |
| Maximal MVC RTD, N·m/s | 180.5 ± 49.9 | 93.9 ± 33.1* | −47.9% |
| Voluntary activation, % | 98.3 ± 1.9 | 97.6 ± 2.1 | |
| Peak twitch tension, N·m | 5.4 ± 1.9 | 3.5 ± 1.3* | −35.2% |
| Twitch average rate of rise, N·m/ms | 0.05 ± 0.01 | 0.03 ± 0.01* | −40.0% |
| Time to peak tension, ms | 105.3 ± 17.1 | 113.6 ± 25.6 | |
| Half-relaxation time, ms | 121.8 ± 16.6 | 164.3 ± 32.1* | +34.8% |
| Twitch rate of relaxation, N·m/ms | 0.04 ± 0.01 | 0.02 ± 0.01* | −50.0% |
| Twitch contraction duration TPT + HRT, ms | 227.1 ± 24.6 | 277.9 ± 43.9* | +22.0% |
| Potentiated twitch tension, N·m | 8.8 ± 2.7 | 4.8 ± 1.5* | −45.5% |
| %Potentiation | 65.4 ± 22.1 | 39.7 ± 17.3* | −39.3% |
Values are means ± SD. MVC, maximal voluntary contraction; RTD, rate of torque development; TPT, time to peak tension; HRT, half-relaxation time.
*
Significant difference between groups (P < 0.05).