ABC | Volume 110, Nº1, January 2018

Original Article Liporaci et al Effects of tilt test in healthy subjects Arq Bras Cardiol. 2018; 110(1):74-83 4.5 3.5 2.5 1.5 0.5 4 3 2 1 0 Minute 1 Minute 2 Minute 3 Minute 4 Minute 5 Minute 6 Minute 7 Minute 8 Minute 9 Minute 10 Minute 11 Minute 12 Minute 13 Minute 14 a b b b b b b Ab ABc c c c c c cm/s TMV Figure 2 – Total mean velocity on the force platform during the Active Stand Test. A, B, C: significant difference with their corresponding minutes (a, b, c); p < 0,05. 160 140 120 100 80 60 40 0 1 2 3 4 5 6 7 8 9 10 11 12 13 EC Time AS HUT Figure 1 – Heart rate behavior during the Active Standing Test (AS) and the Head-Up Tilt Test (HUT). : Mean variation of heart rate during AS. : Mean variation of heart rate during AS. : Significant difference between AS and HUT; p < 0.05. Heart rate in beats per minute (bpm). With respect to TD, significant differences were detected in minutes 3, 6 (second VM), 7, 9 (second VM), 12 (third VM) and 14 in comparison with minute 1 during the AS. Significant differences were also found in minutes 7, 9 (second VM) and 14 in comparison with minute 2, and during the second VM (minute 6) in comparison with minutes 3, 4, 5, 7 and 8. Finally, from minute 10 to 13, significant values were found as compared with minute 9 (Figure 3). When the total time of the test was divided into three parts (pre-VM, VM and post-VM), significant differences were found in TD and TMV between VM and pre-VM, and in TMV between VM and post-VM. 76