Table 2.
Biochemical parameters and ratings of perceived exertion at the baseline, before, and after 8 × 50 m test in the in the AA (amino acids supplemented) and PL (placebo) trials.
| Trial | Baseline | Pre-Ex | Post-Ex | |
|---|---|---|---|---|
| NOx (μM) | AA | 11.61 ± 4.94 | 31.65 ± 29.56 | 23.06 ± 15.28 |
| PL | 12.68 ± 7.42 | 25.84 ± 29.39 | 18.36 ± 11.71 | |
| NH3 (μM) | AA | 115.20 ± 103.49 | 123.72 ± 66.29 | 123.86 ± 65.35 |
| PL | 116.59 ± 40.69 | 109.02 ± 50.89 | 114.81 ± 50.31 | |
| Urea (mM) | AA | 4.64 ± 0.77 | 5.38 ± 0.90 | 5.11 ± 0.91 |
| PL | 4.77 ± 0.65 | 5.01 ± 0.87 | 4.63 ± 0.73 | |
| Lactate (mM) | AA | 1.36 ± 0.56 | 1.91 ± 0.59 | 14.75 ± 4.43 *,† |
| PL | 1.43 ± 0.34 | 1.71 ± 0.38 | 14.12 ± 2.79 *,† | |
| Glycerol (μM) | AA | 46.00 ± 21.00 | 81.89 ± 28.83 * | 240.89 ± 96.61 *,† |
| PL | 44.63 ± 25.27 | 71.35 ± 26.45 | 227.44 ± 58.36 *,† | |
| NEFA (mM) 1 | AA | 0.49 ± 0.27 | 0.42 ± 0.16 | 0.22 ± 0.09 † |
| PL | 0.44 ± 0.25 | 0.38 ± 0.10 | 0.20 ± 0.08 † | |
| RPE 2 | AA | 9.1 ± 2.4 | 15.0 ± 1.8 * | 17.2 ± 2.3 * |
| PL | 9.7 ± 2.4 | 14.8 ± 2.2 * | 17.3 ± 1.8 * |
1 NEFA. non-esterified fatty acids; 2 RPE: ratings of perceived exertion; * Significantly different from the baseline in the same trial, p < 0.001; † Significantly different from Pre-Ex in the same trial, p < 0.05. Pre-Ex: before 8 × 50 m swim test; Post-Ex: immediately after 8 × 50 m swim test.