Table 1.
Summary of the exercise performance data and the responses to the rating of perceived exertion and pain perception scales under the four employed conditions.
| Test | Variable | Placebo | Caffeine | Paracetamol | Caffeine and paracetamol |
|---|---|---|---|---|---|
| Barbell bench press* | Number of repetitions | 13.1 ± 2.8 | 14.3 ± 2.8 | 13.4 ± 2.3 | 13.8 ± 3.1 |
| Isokinetic knee extension at 60°/sec | Peak torque (Nm) | 168.5 ± 44.9 | 171.0 ± 46.1 | 167.6 ± 42.5 | 176.0 ± 47.7 |
| Total work (J) | 460.0 ± 123.7 | 467.7 ± 126.3 | 457.7 ± 113.4 | 480.5 ± 136.1 | |
| Average power (W) | 108.1 ± 31.7 | 108.8 ± 30.9 | 105.7 ± 27.2 | 112.9 ± 33.6 | |
| Isokinetic knee flexion at 60°/sec | Peak torque (Nm) | 92.5 ± 22.6 | 96.1 ± 22.9 | 94.6 ± 26.0 | 97.7 ± 26.4 |
| Total work (J) | 307.3 ± 77.7 | 328.0 ± 77.1 | 317.8 ± 84.1 | 324.5 ± 89.5 | |
| Average power (W) | 68.9 ± 19.5 | 73.0 ± 18.4 | 70.3 ± 19.4 | 72.6 ± 22.4 | |
| Isokinetic knee extension at 180°/sec | Peak torque (Nm) | 121.4 ± 35.6 | 122.9 ± 34.1 | 123.9 ± 31.3 | 123.0 ± 37.5 |
| Total work (J) | 587.4 ± 178.5 | 601.7 ± 176.7 | 599.6 ± 150.1 | 594.6 ± 187.9 | |
| Average power (W) | 199.6 ± 67.8 | 203.7 ± 61.0 | 202.2 ± 52.0 | 200.7 ± 69.4 | |
| Isokinetic knee flexion at 180°/sec | Peak torque (Nm) | 78.4 ± 19.5 | 82.4 ± 17.9 | 81.4 ± 19.9 | 79.4 ± 20.6 |
| Total work (J) | 362.5 ± 122.9 | 391.0 ± 107.4 | 377.5 ± 107.0 | 366.5 ± 131.4 | |
| Average power (W) | 113.4 ± 41.2 | 121.1 ± 35.2 | 116.6 ± 37.2 | 113.3 ± 41.9 | |
| Wingate | Peak power (W) | 585.4 ± 164.2 | 601.4 ± 183.1 | 597.7 ± 179.8 | 591.0 ± 163.6 |
| Mean power (W) | 438.5 ± 115.3 | 447.1 ± 126.3 | 442.2 ± 123.4 | 444.6 ± 119.0 | |
| Minimum power (W) | 283.4 ± 75.4 | 283.9 ± 85.1 | 287.8 ± 81.0 | 275.4 ± 87.8 | |
| Power drop (%) | 50.8 ± 8.4 | 51.5 ± 13.0 | 50.9 ± 9.3 | 52.9 ± 10.9 | |
| RPE after the Wingate test | Arbitrary units (6-20 scale) | 15.6 ± 2.9 | 15.4 ± 2.7 | 16.8 ± 2.0 | 16.3 ± 2.3 |
| PP after the Wingate test | Arbitrary units (0-10 scale) | 4.1 ± 2.4 | 3.5 ± 2.4 | 4.1 ± 2.4 | 3.7 ± 2.4 |
| CMJ | Jump height (cm) | 27.4 ± 5.8 | 27.3 ± 5.8 | 26.9 ± 5.3 | 27.6 ± 5.5 |
| Maximum power (W) | 69.1 ± 10.4 | 68.3 ± 11.1 | 68.0 ± 8.6 | 69.8 ± 9.4 | |
| Contraction time (s) | 0.761 ± 0.084 | 0.813 ± 0.299 | 0.750 ± 0.092 | 0.745 ± 0.069 | |
| Flight time (s) | 0.470 ± 0.049 | 0.470 ± 0.050 | 0.467 ± 0.046 | 0.473 ± 0.047 | |
| Flight time to contraction time | 0.626 ± 0.100 | 0.612 ± 0.120 | 0.630 ± 0.091 | 0.640 ± 0.086 |
Note: RPE: rating of perceived exertion; PP: pain perception; CMJ: countermovement jump test; * data for the bench press were obtained from 28 participants.