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Jugular vein (top panels) and carotid artery (bottom panels) cross sectional area at the end of an inhalation (left panels) and at the end of an exhalation (right panels) in men and women with or without use of a compression collar. Men are black bars, women are grey bars. *indicates a significant effect of Collar; †indicates a significant effect of sex within group; values are mean ± 95% Confidence Interval.
