TABLE 5.

Equipoise diffusion PO₂ in heart and skeletal at different temperatures

	Temperature (°C)
	22*	30	35	40
K0 (ml O2 cm−1 × min−1 . atm−1) × 10−5	2.52	3.08	4.18	4.81
P50 (mmHg)†	0.55	1.21	1.98	3.23
DMb (cm2s−1) ×10−7	4.24	6.09	7.85	8.37
DMbCMb(cm2s−1 mM) × 10−7 myocardium‡	0.81	1.16	1.49	1.59
DMbCMb(cm2s−1 mM) × 10−7 skeletal muscle‡	1.79	2.56	3.29	3.54
Equipoise diffusion PO2 (mmHg) myocardium	2.72	2.63	1.67	0.15
Equipoise diffusion PO2 (mmHg) skeletal muscle	6.67	7.27	6.08	4.24

^*Actual temperature for K₀ measurements: 23°C, 30°C, 34.2°C, 40.4°C (38).

^†P50 calculated from the equation P50 = e^{0.098T–2.748}, where T is in °C (49). Experimentally determined P50 of 1.5 mmHg at ∼25°C and K₀ = 2.52 × 10⁻⁵ ml O₂ cm⁻¹ × min⁻¹ × atm⁻¹ yields equipoise diffusion PO₂ 1.77 mmHg for myocardium and 5.72 for skeletal muscle (10,74).

^‡Mb concentration in rat myocardium assumed as 0.19 mM and 0.42 mM in rat skeletal muscle (10).