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(A) The changes in the proportion of total blood flow toward head (THBF) distributed to each artery during heat stress; (B) the contribution of each cerebral artery blood flow to THBF. *P<0.05 different from the baseline; #P<0.05 different from H1; $P<0.05 different form H2; &P<0.05 different from H3. ECA, external carotid artery; H, heat; ICA, internal carotid artery; VA, vertebral artery.
