Table A2.

Studies examining the acute effect of beetroot supplementation on isolated 30 s sprints (Wingate tests).

Study	Sample Size (n)	Age (Years)	Dosage	Study Design	Exercise Protocol	Primary Outcome
Cuenca et al. 2018 [57]	15	22.4 ± 1.6	6.4 mmol (70 mL)	Randomised, placebo controlled, crossover, double-blind	A 30 s all-out Wingate test. Before and after the sprint exercise and at 30 s and 180 s post-exercise, three counter-movement jumps (CMJ) were performed.	Improved peak (3.9%) and mean (3.9%) power output. Reduced the time taken to reach Wpeak (17.9%)
Domínguez et al. 2017 [56]	15	21.46 ± 1.72	5.6 mmol (70 mL)	Randomised and double blind	A 30 s maximum intensity test on an inertial cycle ergometer.	No impact on the mean power. Peak power improved by 5.4%. Shorter time taken to attain peak power (−8.4%).
Jodra et al. 2020 [58]	15	23.0 ± 2.0	6.4 mmol (70 mL)	Randomised, crossover, double blind	A 30 s all-out Wingate cycling test.	Increased peak power output by 4.4%. Lower the time taken to reach peak (7.3 vs. 8.7 s).