TABLE 2.
Two-way repeated measures analysis of variance (ANOVA) comparing circulating lactate levels, general and local RPE, and heart rate between the different experimental conditions during the steady-state test.
| Variable | Time | Condition | ANOVA | ||||
|---|---|---|---|---|---|---|---|
| PLA | LD | HD | Condition | Time | Condition × time | ||
| Lactate (mmol/L) | Pre | 1.54 ± 0.38 | 2.08 ± 2.21 | 2.43 ± 3.49 | F = 0.58, p = 0.56 ƞp2 = 0.04 | F = 0.03, p = 0.86 ƞp2 = 0.02 | F = 2.68, p = 0.08 ƞp2 = 0.16 |
| Post | 3.37 ± 4.54 | 1.36 ± 0.43 | 1.63 ± 0.51 | ||||
| RPEg (a.u.) | Pre | 0.19 ± 0.40 | 0.06 ± 0.25 | 0.00 ± 0.00 | F = 1.08, p = 0.33 ƞp2 = 0.06 | F = 47.40, p < 0.001* ƞp2 = 0.76 | F = 3.15, p = 0.02* ƞp2 = 0.17 |
| 30′ | 1.94 ± 1.12 | 2.06 ± 1.53 | 2.06 ± 1.34 | ||||
| 60′ | 2.75 ± 1.48 | 3.63 ± 2.31 | 2.94 ± 1.88 | ||||
| RPEquad (a.u.) | Pre | 0.25 ± 0.58 | 0.25 ± 0.45 | 0.06 ± 0.25 | F = 2.65, p = 0.08 ƞp2 = 0.15 | F = 44.30, p < 0.001* ƞp2 = 0.74 | F = 1.62, p = 0.20 ƞp2 = 0.10 |
| 30′ | 1.94 ± 1.29 | 2.56 ± 1.71 | 2.19 ± 1.56 | ||||
| 60′ | 3.06 ± 1.61 | 3.69 ± 2.18 | 3.19 ± 1.80 | ||||
| Heart rate (b/min) | Pre | 70.4 ± 10.2 | 66.6 ± 8.6 | 67.9 ± 9.6 | F = 2.28, p = 0.11 ƞp2 = 0.13 | F = 64.86, p < 0.001* ƞp2 = 0.81 | F = 0.85, p = 0.45 ƞp2 = 0.05 |
| 30′ | 105.5 ± 15.9 | 103.1 ± 16.59 | 102.2 ± 17.8 | ||||
| 60′ | 109.3 ± 19.6 | 107.4 ± 18.1 | 103.9 ± 17.4 | ||||
Mean ± standard deviation. PLA, Placebo; HD, high dose; LD, low dose; Pre; Before the start of the session; 30′, at minute 30 of steady-state test; 60′, at minute 60 of steady test; RPEg, general ratings of perceived effort; RPEquad, ratings of perceived effort in quadriceps; a.u., arbitrary units. * Significant difference: p ≤ 0.05.