Figure 8

The influence of three different representations of HPV over phase difference estimates in the TTSR data set. HPV is estimated by interpolating on the first (INT1) and on the second (INT2) QRS complex, or by using the IPFM model, as in the rest of the study. On the left: phase difference between {x_S(t),x_H(t)}. On the right: phase difference between {−x_R(t),x_H(t)}. Markers and bars represent medians and interquartile ranges of median phase differences${\theta }_{\text{ik}}^{\text{(m)}}\left(s\right)$