The aim of the proposed study is to investigate the effect of increased plasma lactate concentrations on the heart and brain's metabolism of other energy sources, primarily glucose in the brain and glucose and FFA in the heart. The investigator hypothesize that: * An acute increase in lactate plasma concentration will decrease cerebral glucose uptake and increase cerebral blood flow * An acute increase in lactate plasma concentration will decrease palmitate and glucose uptake in the myocardium, and increase myocardial perfusion
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Cerebral glucose uptake
Timeframe: From T=300-360 (minutes)