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Table 1 Pre- and post- 400 m sprint values and sprint-induced changes (Δ) of oxygen and carbon dioxide partial pressure (PO2 / PCO2), active blood bicarbonate concentration ([HCO3]), active base excess (BE), oxygen saturation (sO2), and blood pH value (pHb) after 4 days of an acidizing (ACID) or alkalizing (BASE) dietary intervention

From: Enhanced 400-m sprint performance in moderately trained participants by a 4-day alkalizing diet: a counterbalanced, randomized controlled trial

   ACID BASE p-value
PO2
[mmHg]
pre - sprint 116.3 ± 26.4 118.7 ± 26.2 0.823
post - sprint 118.1 ± 19.1 115.5 ± 20.1 0.789
Δ sprint 1.8 ± 28.3 −3.3 ± 28.6 0.653
PCO2
[mmHg]
pre - sprint 35.1 ± 3.5 36.5 ± 4.9 0.387
post - sprint 31.2 ± 7.5 33.3 ± 5.5 0.385
Δ sprint −3.9 ± 9.3 − 3.3 ± 5.7 0.732
[HCO3]
[mmol/L]
pre - sprint 24.3 ± 2.0 25.9 ± 2.8 0.063
post - sprint 12.8 ± 3.3 13.0 ± 2.4 0.818
Δ sprint −11.4 ± 3.8 −12.9 ± 2.3 0.155
BE
[mmol/L]
pre - sprint 1.30 ± 2.39 2.32 ± 2.20 0.184
post - sprint −13.56 ± 3.39 −13.87 ± 3.27 0.780
Δ sprint −14.86 ± 3.82 −16.19 ± 2.88 0.310
sO2
[%]
pre - sprint 98.4 ± 0.9 98.5 ± 0.6 0.603
post - sprint 97.0 ± 1.2 96.8 ± 1.5 0.668
Δ sprint −1.4 ± 1.3 −1.8 ± 1.6 0.449
pHb pre - sprint 7.46 ± 0.05 7.47 ± 0.03 0.373
post - sprint 7.24 ± 0.04 7.22 ± 0.07 0.294
Δ sprint −0.22 ± 0.06 −0.24 ± 0.07 0.347
  1. Data is presented as mean ± standard deviation of the mean. No significant differences between groups were found using paired sampled t-tests or Wilcoxon tests if variables were not normally distributed (pHb pre-sprint and PCO2 post-sprint). n = 11