Dietary nitrate supplementation improves team sport-specific intense intermittent exercise performance

Lee J Wylie, Magni Mohr, Peter Krustrup, Sarah R Jackman, Georgios Ermιdis, James Kelly, Matthew I Black, Stephen J Bailey, Anni Vanhatalo, Andrew M Jones

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Abstrakt

Recent studies have suggested that dietary inorganic nitrate (NO₃(-)) supplementation may improve muscle efficiency and endurance exercise tolerance but possible effects during team sport-specific intense intermittent exercise have not been examined. We hypothesized that NO₃(-) supplementation would enhance high-intensity intermittent exercise performance. Fourteen male recreational team-sport players were assigned in a double-blind, randomized, crossover design to consume 490 mL of concentrated, nitrate-rich beetroot juice (BR) and nitrate-depleted placebo juice (PL) over ~30 h preceding the completion of a Yo-Yo intermittent recovery level 1 test (Yo-Yo IR1). Resting plasma nitrite concentration ([NO₂(-)]) was ~400% greater in BR compared to PL. Plasma [NO₂(-)] declined by 20% in PL (P < 0.05) and by 54 % in BR (P < 0.05) from pre-exercise to end-exercise. Performance in the Yo-Yo IR1 was 4.2% greater (P < 0.05) with BR (1,704 ± 304 m) compared to PL (1,636 ± 288 m). Blood [lactate] was not different between BR and PL, but the mean blood [glucose] was lower (3.8 ± 0.8 vs. 4.2 ± 1.1 mM, P < 0.05) and the rise in plasma [K(+)] tended to be reduced in BR compared to PL (P = 0.08). These findings suggest that NO₃(-) supplementation may promote NO production via the nitrate-nitrite-NO pathway and enhance Yo-Yo IR1 test performance, perhaps by facilitating greater muscle glucose uptake or by better maintaining muscle excitability. Dietary NO₃(-) supplementation improves performance during intense intermittent exercise and may be a useful ergogenic aid for team sports players.

OriginalsprogEngelsk
TidsskriftEuropean Journal of Applied Physiology
Vol/bind113
Udgave nummer7
Sider (fra-til)1673-84
ISSN1439-6319
DOI
StatusUdgivet - 2013

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Citationsformater

Wylie, L. J., Mohr, M., Krustrup, P., Jackman, S. R., Ermιdis, G., Kelly, J., Black, M. I., Bailey, S. J., Vanhatalo, A., & Jones, A. M. (2013). Dietary nitrate supplementation improves team sport-specific intense intermittent exercise performance. European Journal of Applied Physiology, 113(7), 1673-84. https://doi.org/10.1007/s00421-013-2589-8