Table 3

Haemodynamic measurements and heart rate variability indices of subjects during 60° head up tilt (HUT) position

  • Values are mean (SD).

  • 3-150 (Univariate analysis): p < 0.05 (upright vsupine); (univariate analysis): p < 0.05 (positive HUTv negative HUT); (multivariate analysis: age, sex, number of syncopal attacks, heart rate, systolic and diastolic blood pressure, and all the indices of heart rate variability were included in the regression models): p = 0.005 (positive HUTv negative HUT).

  • BA, bandwidth area; BP, blood pressure; HF, high frequency (0.15 to 0.4 Hz); HR, heart rate; LF, low frequency (0.04 to 0.15 Hz); PP, power peak; +, positive test; −, negative test.