Table 3.
Differences in muscle electrical activity (EMG) in muscular endurance test among experimental conditions
| MPLA | MCAF | EPLA | ECAF | ANOVA effects (partial η2) | |||
|---|---|---|---|---|---|---|---|
| Supplement | Day | Suplement by day | |||||
| Mean ± SD | Mean ± SD | Mean ± SD | Mean ± SD | ||||
| Pectoralis major | |||||||
| RMS (μV) | 329 ± 100 | 255 ± 128 | 322 ± 105 | 322 ± 105 | 0.479 (0.057) | 0.259 (0.139) | 0.259 (0.139) |
| MVC (N) | 752 ± 320 | 630 ± 354 | 794 ± 272 | 794 ± 272 | 0.377 (0.087) | 0.322 (0.109) | 0.322 (0.109) |
| Triceps brachii | |||||||
| RMS (μV) | 307 ± 92 | 287 ± 63 | 297 ± 97 | 324 ± 112 | 0.463 (0.061) | 0.832 (0.050) | 0.330 (0.105) |
| MVC (N) | 895 ± 295 | 882 ± 300 | 887 ± 275 | 998 ± 459 | 0.168 (0.020) | 0.426 (0.072) | 0.401 (0.080) |
| Rectus femoris | |||||||
| RMS (μV) | 207 ± 125 | 183 ± 127 | 202 ± 89 | 194 ± 96 | 0.929 (0.010) | 0.397 (0.066) | 0.663 (0.018) |
| MVC (N) | 625 ± 354 | 659 ± 465 | 700 ± 309 | 668 ± 357 | 0.731 (0.011) | 0.990 (< 0.001) | 0.586 (0.028) |
| Vastus lateralis | |||||||
| RMS (μV) | 189 ± 58 | 191 ± 60 | 154 ± 66 | 159 ± 59 | 0.430 (0.058) | 0.363 (0.076) | 0.349 (0.080) |
| MVC (N) | 479 ± 145 | 507 ± 215 | 400 ± 164 | 503 ± 210 | 0.382 (0.070) | 0.348 (0.080) | 0.350 (0.080) |
Values are means ± SD
RMS root mean square, MVC maximal voluntary contraction, MPLA morning trial ingesting placebo, MCAF morning trial ingesting caffeine, EPLA evening trial ingesting placebo, ECAF evening trial ingesting caffeine