Fig. 3

CSF temporal properties changes when moving from upright to supine. A Heart rate (HR) values plotted for the whole sample show significantly higher HR in upright compared to supine position. B Duration of each CSF phase (diastole or systole) measured within one cardiac cycle in supine and upright position showing in general the CSF diastolic phase is longer than the CSF systolic phase. Notice the significant increase in systolic duration in supine but unchanged diastolic duration. C Fractional duration of systole or diastole in a single cardiac cycle, showing systole covering a larger part of the cycle in supine, at the expenses of the diastolic coverage. [**** = p < 0.0001; ns = not statistically significant]