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Table 7 Blood acid-base balance markers – acute supplementation strategy

From: The influence of progressive-chronic and acute sodium bicarbonate supplementation on anaerobic power and specific performance in team sports: a randomized, double-blind, placebo-controlled crossover study

   BASE SB PLA p-Value
F1 or Χ2 2
\( {\eta}_p^2 \)1 or Kendall’s W2
pH EXERCISE_PRE 7.41 ± 0.02 7.41 ± 0.03 7.41 ± 0.02 0.5931
     1.0001
     0.0461
EXERCISE_POST 7.18 ± 0.04a 7.24 ± 0.05b 7.18 ± 0.04a 0.0002
     15.5002
     0.6462
HCO3¯ (mmol/L) EXERCISE_PRE 25.9 ± 1.0 26.1 ± 1.2 25.6 ± 0.8 0.5582
     1.1672
     0.0492
EXERCISE_POST 13.3 ± 1.5a 15.4 ± 1.9b 13.2 ± 1.6a 0.0002
     18.1672
     0.7572
La (mmol/L) EXERCISE_PRE 1.3 ± 0.33 1.3 ± 0.5 1.2 ± 0.5 0.8502
     0.3262
     0.0142
EXERCISE_POST 16.4 ± 2.5b 17.2 ± 2.2b 15.2 ± 3.0a 0.0092
     9.4562
     0.3942
BE (mmol/L) EXERCISE_PRE 2.4 ± 1.1 2.1 ± 1.4 2.2 ± 1.1 0.9202
     0.1672
     0.0072
EXERCISE_POST −16.1 ± 2.7a −13.0 ± 3.3b −16.4 ± 2.9a 0.0002
     18.0002
     0.7502
  1. 1Data analyzed by one-way ANOVA with repeated measurements; effect size expressed as partial eta-squared (\( {\eta}_p^2 \)); 2Data analyzed by Friedman’s ANOVA and subsequent two-group comparisons by Wilcoxon signed-rank test; effect size expressed as Kendall’s Concordance Coefficient W; ab – different letter inscriptions refer to statistical differences between BASE, PLA and SB. Abbreviations: BASE – baseline (no supplementation), BE – base excess EXERCISE_PRE – value before exercise tests, EXERCISE_POST – value 3 min after the second Wingate anaerobic test, HCO3¯- bicarbonate, La – blood lactate, PLA – after placebo supplementation, SB – after sodium bicarbonate supplementation