Effects of sodium bicarbonate supplementation on physical performance of runners
DOI:
https://doi.org/10.33233/rbfex.v21i3.5163Keywords:
running, sodium bicarbonate, acidosis, dietary supplementsAbstract
Introduction: Sodium bicarbonate (NaHCO3) supplementation has been shown to reduce metabolic acidosis, and to optimize performance in predominantly anaerobic exercises. However, its effects on aerobic exercise remain inconclusive. Objective: This study aimed to evaluate the effects of NaHCO3 supplementation on metabolic acidosis, exercise performance and body composition in 5-km tracking runners. 14 runners were randomly assigned to receive either placebo (PLA = 7; maltodextrin, 2x5 gday-1 for 27 days, and a dose of 0.3 g/kg administered on the 28th day, 60 minutes before the performance test) or NaHCO3 (BIC = 7; maltodextrin, for 22 days; 2x5 gday-1 of NaHCO3 for five days, and a maximum dose (0.3 g/kg) administered on the 28th day before the performance test. The exercise performance was assessed before (PRE) and after (POST) supplementation, through a test consisting of 25 minutes running at 85% of maximal heart rate, followed by running to exhaustion, at 110% of the speed obtained in incremental test. Metabolic acidosis was assessed by urinary anion gap at before and after the intervention. Results: The mean time to exhaustion was 93.6 ± 21.2 and 82.6 ± 18.2 in PRE, and 130.3 ± 35.2 and 92.8 ± 17.0 seconds in POST (BIC and PLA, respectively). At rest, urinary anion gap was positive in both groups, in PRE and POST. After exercise, the means in the PRE were -26,2 ± 8,2 and -26,1 ± 3,7, and POST -14,9 ± 14,6 and -27,7 ± 4,0 mEq/L (BIC and PLA respectively). There was a negative correlation (-0.78) between metabolic acidosis and time to exhaustion. Conclusion: The study showed that sodium bicarbonate supplementation promoted performance improvement and urinary anion gap alteration in tracking runners submitted to the exhaustion test.
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