Table 1.
Parameters (mean ± SEM, n = 9) of the cortical (motor-evoked potentials, MEPs) and peripheral electrical (compound motor action potentials, Mmax) and mechanical (twitch, Tw) responses evoked by peripheral electrical nerve (PNS) and transcranial magnetic (TMS) stimulation in resting musculus vastus medialis before and 1 h after ingestion of placebo or caffeine supplements.
| Parameters | Placebo |
Caffeine |
||
|---|---|---|---|---|
| Pre-pill | 1 h post pill | Pre-pill | 1 h post pill | |
| I. PNS | ||||
| Mmax amplitude (mV) | 5.1 ± 0.7 | 4.6 ± 0.6 | 4.3 ± 0.5 | 3.4 ± 0.6 |
| Mmax area (mV·ms) | 33.2 ± 5.0 | 29.0 ± 5.5 | 26.6 ± 3.5 | 22.1 ± 4.3 |
| Resting Tw amplitude (N) | 17.3 ± 2.0 | 16.9 ± 2.0 | 16.0 ± 1.5 | 15.0 ± 1.2 |
| Contraction time (ms)a | 48.2 ± 6.0 | 54.5 ± 5.5 | 44.2 ± 3.3 | 42.5 ± 2.5 |
| II. TMS | ||||
| MEP amplitude (% Mmax amplitude) | 10.1 ± 2.2 | 8.5 ± 1.3 | 11.2 ± 2.3 | 17.9 ± 6.1 |
| MEP area (% Mmax area) | 14.6 ± 3.9 | 12.4 ± 2.1 | 13.7 ± 2.5 | 27.8 ± 10.8 |
aMain condition effect.