Table 2.

Blood gas, acid–base, and lactate values before and after the 200-m swimming tests

	WATER		NaHCO3
	First 200 m	Second 200 m	First 200 m	Second 200 m
pCO2 pre (kPa)	5.0 ± 0.3	4.9 ± 0.4	5.1 ± 0.2	5.4 ± 0.4
pCO2 post (kPa)	5.0 ± 0.3	5.0 ± 0.4	5.1 ± 0.5	5.3 ± 0.4
pH pre	7.40 ± 0.03	7.40 ± 0.02	7.39 ± 0.02	7.46 ± 0.03*
pH post	7.16 ± 0.04	7.20 ± 0.05	7.19 ± 0.04	7.30 ± 0.05*
[${\mathit{HCO}}_3^{-}$]pre (mmol L−1)	23.7 ± 1.4	23.3 ± 1.7	23.7 ± 0.8	28.4 ± 2.4*
[${\mathit{HCO}}_3^{-}$]post (mmol L−1)	12.7 ± 2.4	14.8 ± 1.5	14.5 ± 1.1	19.2 ± 2.3*
BE pre	− 1.2 ± 1.7	− 1.6 ± 2.2	− 0.9 ± 1.0	4.5 ± 2.8*
BE post	− 15.0 ± 4.4	− 12.1 ± 2.0	− 12.4 ± 1.7	− 6.1 ± 2.9*
[LA]pre (mmol L−1)	1.8 ± 0.8	2.3 ± 0.9	1.7 ± 0.4	2.1 ± 0.5*
[LA]post (mmol L−1)	14.7 ± 2.3	11.1 ± 2.5	13.3 ± 2.4	13.1 ± 3.5

^* p < 0.05, different from other trials

WATER—denotes water-drinking conditions

NaHCO₃—denotes NaHCO₃-drinking conditions