CEREBRAL BLOOD FLOW REGULATION DURING EXERCISE IN TWO ROOTS OF BRAIN ARTERY

大脑的血液供应来源于两个根，颈内动脉（ICA）和椎动脉（VA）。ICA向形成脑前循环的大脑皮层供血，VA向形成脑后循环的枕皮质、小脑和脑干供血。虽然之前的研究假设运动时两根脑血流相似，但本研究表明两根脑血流存在不同的反应，表明脑循环存在区域差异。此外，动脉CO_2反应性的差异被发现是脑循环区域差异的中介。

Blood supply to the brain originates from two roots, the internal carotid arteries (ICA) and the vertebral arteries (VA). ICA provides blood to cerebral cortex forming the anterior cerebral circulation, while VA supplies blood to occipital cortex, cerebellum, and brainstem forming the posterior cerebral circulation. Although previous studies assumed that the cerebral blood flow in two roots were similar during exercise, the present study demonstrated that there are different responses between two roots indicating regional differences in the brain circulation. Further, difference in arterial CO_2 reactivity found to be a mediator for the regional difference in the brain circulation.