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Randomized Controlled Trial
. 2018 May 30;10(6):697.
doi: 10.3390/nu10060697.

The Effect of a New Sodium Bicarbonate Loading Regimen on Anaerobic Capacity and Wrestling Performance

Free PMC article
Randomized Controlled Trial

The Effect of a New Sodium Bicarbonate Loading Regimen on Anaerobic Capacity and Wrestling Performance

Krzysztof Durkalec-Michalski et al. Nutrients. .
Free PMC article


Gastrointestinal side effects are the main problem with sodium bicarbonate (SB) use in sports. Therefore, our study assessed the effect of a new SB loading regimen on anaerobic capacity and wrestling performance. Fifty-eight wrestlers were randomized to either a progressive-dose regimen of up to 100 mg∙kg-1 of SB or a placebo for 10 days. Before and after treatment, athletes completed an exercise protocol that comprised, in sequence, the first Wingate, dummy throw, and second Wingate tests. Blood samples were taken pre- and post-exercise. No gastrointestinal side effects were reported during the study. After SB treatment, there were no significant improvements in the outcomes of the Wingate and dummy throw tests. The only index that significantly improved with SB, compared to the placebo (p = 0.0142), was the time-to-peak power in the second Wingate test, which decreased from 3.44 ± 1.98 to 2.35 ± 1.17 s. There were also no differences in blood lactate or glucose concentrations. In conclusion, although the new loading regimen eliminated gastrointestinal symptoms, the doses could have been too small to elicit additional improvements in anaerobic power and wrestling performance. However, shortening the time-to-peak power during fatigue may be particularly valuable and is one of the variables contributing to the final success of a combat sports athlete.

Keywords: Wingate test; alkalosis; buffering; combat sports; dummy test.

Conflict of interest statement

I.Ł. receives a salary from the pharmaceutical distributor, who offers different alkali products. However, the content of this study was not constrained by this fact. Moreover, our adherence to Nutrients’ policies on the sharing of data and materials was unaffected. The other authors have no conflicts of interest to declare.


Figure 1
Figure 1
A flowchart of the study design. Abbreviations: T1—1st series of test procedures, T2—2nd series of test procedures, REST—the rest interval between exercise sets, PLA—placebo, SB—sodium bicarbonate, WT1—the Wingate test before the dummy throw test, WT2—the Wingate test after the dummy throw test, DT—the dummy throw test.
Figure 2
Figure 2
Time-to-peak power in the anaerobic Wingate test. (A) Before and after sodium bicarbonate. (B) Before and after placebo. Values are means ± standard deviation (and 95% confidence intervals). Abbreviations: SBpre—before sodium bicarbonate supplementation, SBpost—after sodium bicarbonate supplementation, PLApre—before placebo treatment, PLApost—after placebo treatment, WT1—the Wingate test before the dummy throw test, WT2—the Wingate test after the dummy throw test. * significantly different from SBPRE in the WT2 (p = 0.0018), # significantly different from PLAPOST in the WT2 (p = 0.0142).
Figure 3
Figure 3
Total number of throws in the dummy throw test. SB—sodium bicarbonate group; PLA—placebo group.

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