Effects of 4 Weeks of Beta-Alanine Supplementation on Swim Performance Parameters in Water Polo Players
In water polo several high-intensity efforts are performed, leading to the fatigue process due to accumulation of hydrogen ions, and thus β-alanine supplementation could be an efficient strategy to increase the intramuscular acid buffer. Therefore, the purpose of this study was to investigate whether 4 weeks of β-alanine supplementation enhances parameters related to water polo performance.
Twenty-two highly-trained male water polo players of national level were randomly assigned to receive either 28 days of β-alanine or a placebo (4.8g/day of the supplement in the first 10 days and 6.4g/day in the final 18 days). The participants performed: 30-s maximal tethered swimming (30TS), 200-m swimming performance (P200m) and 30-s crossbar jumps (30CJ) before and after the supplementation period.
The β-alanine group presented significant increases in the 30TS for mean force (p=.04; Δ=30.5±40.4%) and integral of force (p=.05; Δ=28.0±38.0%) as well as the P200m (p=.05; Δ=-2.2±2.6%), while the placebo group did not significantly differ for mean force (p=.13; Δ=24.1±33.7%); integral of force (p=.12; Δ=24.3±35.1%) or P200m (p=.10; Δ=-1.6±3.8%). However, there was no significant group effect for any variable and the magnitude-based inference analysis showed unclear outcomes between-groups (Cohen’s d±95%CL; mean force=0.16±0.83; integral of force=0.12±0.84; and P200m=0.05±0.30). For 30CJ the results were similar, with improvements in both groups (placebo, Δ=14.9±14.1%; β-alanine, Δ=16.9±18.5%), but with no significant interaction effect between-groups and an unclear effect (0.14±0.75).
Autor / Fonte:Gabriel Motta Pinheiro Brisola, Fabio Milioni, Marcelo Papoti, Alessandro Moura Zagatto International Journal of Sports Physiology and Performance 2016 December 14, : 1-25