Table 1.

NMR and NIRS Values

	Exercise
	10% MVC	20% MVC	30% MVC	Recovery	Ischemia	Reperfusion
NMR measurements
deoxyMb, %	6*	23 ± 7	40 ± 9	NM	100	NM
Po2, mmHg	45.90*	9.81	4.40	NM	ND	NM
ΔPCr, %	11 ± 4	20 ± 7	34 ± 10	NM	7 ± 2	NM
ΔpH	0.02 ± 0.02	0.08 ± 0.06	0.21 ± 0.14	NM	0.05 ± 0.05	NM
VPCr, mM/min	NM	NM	NM	15.6 ± 3.5	NM	NM
kPCr, min−1	NM	NM	NM	1.16 ± 0.19	NM	NM
t1/2 PCr, min	NM	NM	NM	0.27 ± 0.04	NM	NM
t1/2 DMb, min	NM	NM	NM	NM	2.2 ± 0.8	0.9 ± 0.2
NIRS measurements
deoxyMb-Hb, %	19 ± 10	33 ± 18	47 ± 32	NM	100	NM
Po2, mmHg	12.5	5.95	3.3	NM	NM	NM
t1/2 DMb-DHb, min	0.7 ± 0.2	0.5 ± 0.3	0.4 ± 0.3	0.4 ± 0.2	1.4 ± 0.3	0.2 ± 0.0

Values are expressed as means ± SD. DMb and DMb-Hb signals are normalized to the signal at end of ischemia as 100%. ΔPCr and ΔpH, change relative to resting value. V_PCr and k_PCr,  initial rate and the rate constant of PCr resynthesis, respectively; t_1/2 PCr, t_1/2 DMb, and t_1/2 DMb-DHb, half-time of PCr, deoxyMb, and deoxyMb-Hb kinetics, respectively. Po₂ calculation used a P₅₀ of 2.93 mmHg. NM, not measurable; ND, not defined.

^*DMb signal was not detectable in all subjects.