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[This corrects the article DOI 10.3389/fphys.2019.01432.].Introduction Chronic exposure to the weightlessness-induced cephalad fluid shift is hypothesized to be a primary contributor to the development of spaceflight-associated neuro-ocular syndrome (SANS) and may be associated with an increased risk of venous thrombosis in the jugular vein. This study characterized the relationship between gravitational level (Gz-level) and acute vascular changes. Methods Internal jugular vein (IJV) cross-sectional area, inferior vena cava (IVC) dia