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Cardiac oxygen and energy substrate consumption in N (n = 7), HF (n = 7), and Rec (n = 6) dogs. A: myocardial O2 consumption (MV̇o2); B: free fatty acid (FFA) oxidation; C: glucose oxidation; D: net lactate uptake. Values are means ± SE. *P < 0.05 vs. C.
