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• W2617239728 abstract "PURPOSE: We previously found that cognitive function was not impaired during prolonged exercise, despite a conflict between an increase in cerebral metabolism and a decrease in cerebral blood flow (CBF), and suggested that improved cognitive function during exercise may be due to the augmented cerebral neuronal activation and metabolism associated with exercise, rather than cerebral perfusion. On the other hand, previous studies have demonstrated that during heavy exercise, compensatory increases in the uptake (the difference between arterial and venous concentration) of lactate, glucose and oxygen support elevated brain neuronal activity and metabolism. The purpose of this study was to examine the relationship between cerebral metabolism (e.g., lactate, glucose, oxygen) and executive function (EF) to a repeated high-intensity interval exercise (HIIE), which decreases systemic lactate concentration and post-exercise EF in a later HIIE session. METHODS: 14 healthy male subjects performed two HIIE protocols (4 sets of high-intensity exercise for 4-min with 3-min active recovery) separated by a 60 min resting period. Blood samples were obtained from the bulb of the right internal jugular vein and a brachial artery to determine concentration differences (a-v diff) for lactate, glucose, and oxygen across the brain. Transcranial Doppler determined middle cerebral artery blood flow velocity (MCA Vmean) as an index of regional CBF. Cerebral metabolic rates of lactate (CMRlactate), glucose (CMRglucose), and oxygen (CMRO2) were calculated as MCA Vmean × a-v diff, respectively. To evaluate EF, color-word Stroop tasks were performed. RESULTS: Post-exercise EF improvement, a-v difflactate, and CMRlactate analyses showed a significant main effect for condition (P < 0.05, respectively), indicating that both EF improvement and brain lactate uptake were attenuated after 2nd HIIE compared to 1st HIIE. While a-v diffglucose, CMRglucose, and a-v diffoxygen were no significant main effects for condition, chronological reduction in a-v difflactate and EF after HIIE were associated with decrease in CMRO2 (P < 0.05, respectively). CONCLUSION: These results suggest that the reduction in brain lactate uptake concomitant with the decrease in CMRO2 after repeated HIIE might be involved in the decline in EF improvement." @default.
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• W2617239728 date "2017-05-01" @default.
• W2617239728 modified "2023-09-26" @default.
• W2617239728 title "Cerebral Energy Metabolism And Executive Function After Repeated High-intensity Interval Exercise With Decreased Lactate Concentration" @default.
• W2617239728 doi "https://doi.org/10.1249/01.mss.0000518508.70652.62" @default.
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