Influence of short-term oscillations on the PTT-SBP relationship

This pilot study investigates the role of the short term variability on the correlation between Pulse Transit Time (PTT) and Systolic Blood Pressure (SBP). PTT and SBP were recorded for 5 min at rest and during recovery after exercise in 4 healthy volunteers. Results indicate that the removal of the fastest oscillations of variability (i.e. those with periods in the order of seconds) increases the strength of the PTT-SBP link, makes it clear the structure of this link, and improve the accuracy of the SBP prediction from the PTT measure.