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Individual values of jugular vein volume (A; n = 12), portal vein cross-sectional area (B; n = 10), and middle cerebral vein velocity (C; n = 12) preflight (supine) and on FD150 with and without the application of LBNP. Values are presented as a percentage of preflight supine (pre-supine) values. FD150, 150th day of spaceflight; LBNP, lower body negative pressure.
