Table 4.

Muscle metabolism during 10 s sprints performed after a standardized warm‐up (Control), and at the end of an incremental exercise to exhaustion in normoxia ($P_{\mathrm{I}{\mathrm{O}}_2}$ = ∼143 mmHg) and severe hypoxia ($P_{\mathrm{I}{\mathrm{O}}_2}$ = ∼73 mmHg), following recovery periods of either 10 or 60 s with vascular occlusion (n = 11)

	Control	Nx 10 s	Nx 60 s	Hyp 10s	Hyp 60s	Main $F_{\mathrm{I}{\mathrm{O}}_2}$ (P)	Main Occ (P)	Interaction $F_{\mathrm{I}{\mathrm{O}}_2}$ × Occ (P)
Legs ${\dot{V}}_{{\mathrm{O}}_2}$ (l min−1)	0.542 ± 0.229a	1.562 ± 0.325	0.937 ± 0.313b	1.958 ± 0.488b,c	0.775 ± 0.287b,d	0.09	0.001	0.003
Legs ${\dot{V}}_{{\mathrm{O}}_2}$ (ml kg−1 min−1)	75.9 ± 36.7a	216.5 ± 56.0	129.8 ± 46.4b	272.7 ± 82.3b,c	108.9 ± 45.5b,d	0.09	0.001	0.003
ATP turnover ${\dot{V}}_{{\mathrm{O}}_2}$ (mmol kg−1 s−1)	0.106 ± 0.045a	0.306 ± 0.064	0.184 ± 0.061b	0.384 ± 0.096b,c	0.152 ± 0.056b,d	0.09	0.001	0.003
ATP turnover total O2 (mmol kg−1 s−1)	0.205 ± 0.058a	0.434 ± 0.091	0.293 ± 0.077b	0.526 ± 0.135b,c	0.258 ± 0.076b,d	0.09	0.001	0.002
Total ATP demand (mmol kg−1 s−1)	1.184 ± 0.250a	0.625 ± 0.123	0.785 ± 0.173b	0.698 ± 0.187	0.792 ± 0.220b	0.294	0.003	0.251
Anaerobic ATP turnover (mmol kg−1 s−1)	0.980 ± 0.213a	0.191 ± 0.058	0.492 ± 0.164b	0.172 ± 0.161c	0.534 ± 0.219b,d	0.779	0.001	0.358
%Anaerobic	82.7 ± 3.2a	30.4 ± 6.9	61.7 ± 10.8	22.3 ± 16.8	65.8 ± 11.3	0.530	0.001	0.051
ATP turnover occlusion (mmol kg−1 s−1)			0.176 ± 0.142		0.185 ± 0.234
Anaerobic reserve (mmol kg−1)			17.3 ± 9.8		17.8 ± 16.2

^a P < 0.05 compared with the other conditions;

^b P < 0.05 compared with Nx 10 s;

^c P < 0.05 compared with Nx 60 s;

^d P < 0.05 compared with Hyp 10 s;

RM ANOVA (2 × 2) Main $F_{\mathrm{I}{\mathrm{O}}_2}$: main oxygenation effect due to the conditions in which the incremental exercise test was performed (Nx: normoxia; Hyp: hypoxia); RM ANOVA (2 × 2) Main Occ: main occlusion effect due to the duration of the occlusion (10 s vs. 60 s); assuming a wet‐to‐dry weight muscle ratio of 4.5:1 (Putman et al. 1998); ATP turnover total O₂ = aerobic ATP turnover from leg ${\dot{V}}_{{\mathrm{O}}_2}$ + ATP turnover from O₂ stores; Anaerobic ATP turnover: energy supplied by phosphagens and glycolysis (the energy supplied by lactate oxidation is computed as aerobic ATP turnover).