High-dose beta-alanine supplementation for two weeks did not enhance intermittent endurance or sprint performance in trained futsal players

There was a significant main effect of time for distance covered in the FIET (Pre-BA: 1618.13 ± 268.14 m; Post-BA: 1857.50 ± 277.81 m; Pre-PLA: 1519.13 ± 243.19 m; Post-PLA: 1621.88 ± 323.65 m; <i>p</i> = 0.003; ηp² = 0.73), while no significant interaction effect was revealed for FIET (<i>p</i> = 0.147; ηp² = 0.27). Furthermore, no significant interaction effects were found in the 30-m sprint test (<i>p</i> = 0.149; ηp² = 0.27, Pre-BA: 4.33 ± 0.25 s; Post-BA: 4.22 ± 0.124 s; Pre-PLA: 4.33 ± 0.26 s; Post-PLA: 4.37 ± 0.22 s). Neither plasma lactate levels nor RPE showed significant main effects of treatment or timepoint (all <i>p</i> > 0.5). Conclusion: Two weeks of high-dose BA supplementation did not have an ergogenic impact on the distance covered during the intermittent endurance test, sprint performance, blood lactate, or RPE in trained futsal players.