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Cerebral lactate and glucose exchange during prolonged exercise. Values are means ± SE for 10 participants. Data presented are from the dehydration trial. A: a-v glucose concentration ([Glu]) difference. B: brain glucose uptake. C: O2-to-glucose index. D: a-v lactate concentration ([La]) difference. E: brain lactate exchange. F: O2-to-carbohydrate index. *P < 0.05 vs. rest.
