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Figure 4 Correlation between plasma lactate levels and values for myocardial fatty acid utilization (MFAU) and oxidation (MFAO) and myocardial glucose utilization (MGU) all corrected for myocardial oxygen consumption (MVO₂) in both younger and older subjects. There was no relationship between the plasma lactate level and MFAU/MVO₂ (A), MFAO/MVO₂ (B), MGU/MVO₂ (C).