Table 2.
Muscle metabolic responses (means ± SD) during high-intensity exercise in normoxic control and in hypoxia after placebo (H-PL) and nitrate supplementation (H-BR)
| H-PL | H-BR | CON | |
|---|---|---|---|
| [PCr] (mm) | |||
| Baseline | 33.1 ± 2.8 | 30.6 ± 3.9 | 31.2 ± 2.8 |
| Δ 60 s | −13.2 ± 2.7 | −11.1 ± 2.9* | −11.4 ± 2.7* |
| Δ 120 s | −16.6 ± 2.2 | −14.1 ± 3.0* | −15.1 ± 3.1 |
| Δ 180 s | −18.4 ± 2.4 | −16.1 ± 3.2* | −17.3 ± 3.3 |
| At task failure | 12.0 ± 3.6 | 11.3 ± 3.3 | 12.1 ± 2.4 |
| Δ (μm s−1) | −63 ± 28 | −48 ± 21* | −48 ± 24* |
| [Pi] (mm) | |||
| Baseline | 3.3 ± 0.7 | 3.1 ± 0.7 | 3.2 ± 0.9 |
| Δ 60 s | 10.4 ± 2.5 | 8.5 ± 2.1* | 8.5 ± 2.5* |
| Δ 120 s | 15.0 ± 3.3 | 12.2 ± 3.0* | 11.7 ± 3.9* |
| Δ 180 s | 17.1 ± 4.4 | 13.8 ± 4.3* | 13.4 ± 4.0* |
| At task failure | 21.4 ± 4.7 | 19.1 ± 5.4 | 18.3 ± 3.3 |
| Δ (μM s−1) | 54 ± 26 | 40 ± 21* | 39 ± 24* |
| [ADP] (μM) | |||
| Baseline | 7.6 ± 1.1 | 6.9 ± 1.6 | 7.2 ± 1.4 |
| Δ 60 s | 48.1 ± 17.4 | 33.6 ± 11.3* | 34.4 ± 13.0* |
| Δ 120 s | 59.7 ± 18.5 | 44.0 ± 13.6* | 46.7 ± 15.0 |
| At task failure | 102.9 ± 58.6 | 84.2 ± 28.6 | 75.5 ± 19.9 |
| Δ (nm s−1) | 286 ± 177 | 191 ± 104 | 177 ± 107 |
| pH | |||
| Baseline | 7.03 ± 0.03 | 7.02 ± 0.03 | 7.01 ± 0.03 |
| At task failure | 6.85 ± 0.07 | 6.89 ± 0.07 | 6.88 ± 0.08 |
| Rate of change (ks−1) | −0.52 ± 0.24 | −0.34 ± 0.30* | −0.32 ± 0.29* |
Note that there were no significant differences in any of the variables between H-BR and CON. Amplitude indicates the change from baseline to task failure. ks, kiloseconds.
*
Different from H-PL, P < 0.05.