Table 4.

Protocol 2 blood gases

	Rest 1	Normoxic exercise	Rest 2	Steady‐state hypoxia	Hypoxic exercise
Control
pHa	7.45 ± 0.01	7.44 ± 0.01	7.44 ± 0.01	7.45 ± 0.01	7.43 ± 0.01
$P_{\mathrm{aC}{\mathrm{O}}_2}$ (mmHg)	31.2 ± 1.5	32.0 ± 1.7	32.7 ± 1.0	32.1 ± 1.1	32.0 ± 1
[Hb]a (g dL−1)	14.7 ± 0.4	14.7 ± 0.4	14.5 ± 0.4	14.5 ± 0.4	14.4 ± 0.3
$S_{\mathrm{a}{\mathrm{O}}_2}$ (%)	96.0 ± 0.5	96.3 ± 0.3	96.1 ± 0.3	79.6 ± 0.8†‡	81.6 ± 0.7†‡
$P_{\mathrm{a}{\mathrm{O}}_2}$ (mmHg)	85.9 ± 3.0	88.4 ± 2.8	84.5 ± 1.5	43.1 ± 0.7†‡	46.0 ± 0.6†‡
$C_{\mathrm{a}{\mathrm{O}}_2}$ (mL L−1)	197 ± 5	197 ± 5	195 ± 5	159 ± 5†‡	164 ± 5†‡
Na+/K+‐ATPase, KIR channel block
pHa	7.45 ± 0.01	7.44 ± 0.01	7.44 ± 0.01	7.45 ± 0.01	7.44 ± 0.01
$P_{\mathrm{aC}{\mathrm{O}}_2}$ (mmHg)	29.7 ± 1.0*	29.2 ± 1.1*	31.7 ± 1.1	30.0 ± 1.2*	31.2 ± 1.1
[Hb]a (g dL−1)	14.9 ± 0.4	14.4 ± 0.4†	14.9 ± 0.4*	14.8 ± 0.4	15.0 ± 0.4*
$S_{\mathrm{a}{\mathrm{O}}_2}$ (%)	96.4 ± 0.2	96.2 ± 0.2	96.1 ± 0.2	80.5 ± 0.9†‡	80.4 ± 0.7†‡
$P_{\mathrm{a}{\mathrm{O}}_2}$ (mmHg)	87.0 ± 2.1	86.9 ± 2.1	84.3 ± 1.7	43.9 ± 0.8†‡	44.4 ± 0.9†‡
$C_{\mathrm{a}{\mathrm{O}}_2}$ (mL L−1)	201 ± 6	194 ± 6	200 ± 6	165 ± 6†‡	168 ± 5†‡

^* P < 0.05 vs. control; ^† P < 0.05 vs. rest (within trial); ^‡ P < 0.05 vs. normoxic exercise; all comparisons within protocol.