Table 1. Amplitude of the potentiated high-frequency paired-pulse force (PDb100), potentiated peak twitch force (Pt), estimated resting twitch (ERT) and ratio of paired-pulse peak forces at 10 Hz to 100 Hz (Db10∶100) in the knee extensor muscles, and EMG (M-wave) responses to single-pulse stimuli for rectus femoris (RF), vastus lateralis (VL) and vastus medialis (VM) muscles before (PRE), after 80 min (MID1) and 160 min (MID2) of cycling and after the 4-h cycling exercise (POST).
| PRE | MID1 | MID2 | POST | ||
| PDb100 (N) | 281±20 | 224±27*** | 223±23*** | 215±19*** | |
| Pt (N) | 171±26 | 137±31** | 131±30** | 123±29** | |
| ERT (N) | 119±35 | 90±35* | 82±31* | 75±25** | |
| Db10∶100 | 1.04±0.09 | 0.79±0.14** | 0.81±0.15* | 0.75±0.16** | |
| RF | 9.0±2.2 | 7.2±2.6** | 7.2±2.3*** | 7.5±2.3* | |
| M-wave amplitude (mV) | VL | 16.4±3.0 | 13.7±4.5 | 13.3±4.3* | 12.3±5.2 |
| VM | 12.8±3.5 | 10.3±3.6 | 10.1±3.5* | 11.2±2.9 | |
| RF | 9.9±1.6 | 10.7±2.7 | 10.5±2.6 | 9.7±2.0 | |
| M-wave duration (ms) | VL | 8.3±1.1 | 8.9±2.0 | 9.4±1.4*** | 10.2±1.5** |
| VM | 8.6±1.5 | 10.8±3.4* | 12.7±2.9* | 13.0±3.1** |
Data are mean values ± SD. Significantly different from PRE: *P<0.05, **P<0.01, ***P<0.001.