Distribution of haemodynamic parameters in Wistar–Kyoto (WKY, n = 29) and spontaneously hypertensive rats (SHR, n = 30). SBP and SBPV, systolic blood pressure and its variability; DBP and DBPV, diastolic blood pressure and its variability; HR and HRV, heart rate and its variability; Δ, dark–light difference; PP, pulse pressure; AASI, ambulatory arterial stiffness index. Maximal, minimal, and mean values are shown. *P < 0.05, **P < 0.01 SHR versus WKY.