Dietary nitrate improves sprint performance and cognitive function during prolonged intermittent exercise
It is possible that dietary nitrate (NO3−) supplementation may improve both physical and cognitive performance via its influence on blood flow and cellular energetics.
To investigate the effects of dietary NO3− supplementation on exercise performance and cognitive function during a prolonged intermittent sprint test (IST) protocol, which was designed to reflect typical work patterns during team sports.
In a double-blind randomised crossover study, 16 male team-sport players received NO3−-rich (BR; 140 mL day−1; 12.8 mmol of NO3−), and NO3−-depleted (PL; 140 mL day−1; 0.08 mmol NO3−) beetroot juice for 7 days. On day 7 of supplementation, subjects completed the IST (two 40-min “halves” of repeated 2-min blocks consisting of a 6-s “all-out” sprint, 100-s active recovery and 20 s of rest), on a cycle ergometer during which cognitive tasks were simultaneously performed.
Total work done during the sprints of the IST was greater in BR (123 ± 19 kJ) compared to PL (119 ± 17 kJ; P < 0.05). Reaction time of response to the cognitive tasks in the second half of the IST was improved in BR compared to PL (BR first half: 820 ± 96 vs. second half: 817 ± 86 ms; PL first half: 824 ± 114 vs. second half: 847 ± 118 ms; P < 0.05). There was no difference in response accuracy.
These findings suggest that dietary NO3− enhances repeated sprint performance and may attenuate the decline in cognitive function (and specifically reaction time) that may occur during prolonged intermittent exercise.
KeywordsNitric oxide Dietary supplementation Cognitive performance Sprint performance
- Bailey SJ, Winyard P, Vanhatalo A, Blackwell JR, Dimenna FJ, Wilkerson DP, Tarr J, Benjamin N, Jones AM (2010b) Dietary nitrate supplementation reduces the O2 cost of low-intensity exercise and enhances tolerance to high-intensity exercise in humans. J Appl Physiol 107(4):1144–1155CrossRefGoogle Scholar
- Coggan AR, Leibowitz JL, Kadkhodayan A, Thomas DP, Ramamurthy S, Spearie CA, Waller S, Farmer M Peterspn LR (2014) Effect of acute dietary nitrate intake on maximal knee extensor speed and power in healthy mean and women. Nitric Oxide (in press)Google Scholar
- Kelly J, Vanhatalo A, Bailey SJ, Wylie LJ, Tucker C, List S, Winyard PG, Jones AM (2014) Dietary nitrate supplementation: effects on plasma nitrite and pulmonary O2 uptake dynamics during exercise in hypoxia and normoxia. Am J Physiol Regul Integr Comp Physiol 307(7):R920–R930CrossRefPubMedGoogle Scholar