Preprocessing Unevenly Sampled RR Interval Signals to Enhance Estimation of Heart Rate Deceleration and Acceleration Capacities in Discriminating Chronic Heart Failure Patients from Healthy Controls

Table 4

DC_conv and AC_conv and indices computed from preprocessed RRI signals for healthy and CHF subjects.

	CHF subjects	Healthy subjects	Value
DCconv (ms)	2.11 ± 2.96	6.82 ± 2.01	<0.001
DCp (ms)	1.79 ± 2.16	7.37 ± 3.03	<0.001
ACconv (ms)	−5.35 ± 3.60	−8.00 ± 2.56	<0.001
ACp (ms)	−2.34 ± 2.10	−6.08 ± 2.17	<0.001

The preprocessing resampling frequency was 2 Hz for both DC_p and AC_p, and the optimal scales were 6 and 14, respectively.