| Autor: |
Tan, Rachel, Wylie, Lee J., Wilkerson, Daryl P., Vanhatalo, Anni, Jones, Andrew M. |
| Předmět: |
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| Zdroj: |
Journal of Sports Sciences; May2022, Vol. 40 Issue 10, p1149-1157, 9p, 1 Diagram, 1 Chart, 3 Graphs |
| Abstrakt: |
Dietary nitrate (NO3–) supplementation can reduce the oxygen cost of submaximal exercise, but this has not been reported consistently. We hypothesised that the number of step transitions to moderate-intensity exercise, and corresponding effects on the signal-to-noise ratio for pulmonary V ˙ O2, may be important in this regard. Twelve recreationally active participants were assigned in a randomised, double-blind, crossover design to supplement for 4 days in three conditions: 1) control (CON; water); 2); PL (NO3–-depleted beetroot juice); and 3) BR (NO3–-rich beetroot juice). On days 3 and 4, participants completed two 6-min step transitions to moderate-intensity cycle exercise. Breath-by-breath V ˙ O2 data were collected and V ˙ O2 kinetic responses were determined for a single transition and when the responses to 2, 3 and 4 transitions were ensemble-averaged. Steady-state V ˙ O2 was not different between PL and BR when the V ˙ O2 response to one-, two- or three-step transition was compared but was significantly lower in BR compared to PL when four-step transitions was considered (PL: 1.33 ± 0.34 vs. BR: 1.31 ± 0.34 L·min−1, P < 0.05). There were no differences in pulmonary V ˙ O2 responses between CON and PL (P > 0.05). Multiple step transitions may be required to detect the influence of NO3− supplementation on steady-state V ˙ O2. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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