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 3

Optimal scale per resampling frequency and pseudofrequency corresponding to each combination of resampling frequency and scale.

Resampling frequency (Hz)	Optimal scale		Pseudofrequency (Hz)		Optimal AUC
	DC	AC	DC	AC	DC	AC
/	2^a	2^a	/	/	0.920	0.818
/	4^b	1^b	/	/	0.940	0.917
2	6	14	0.33	0.14	0.942	0.923
3	9	21	0.33	0.14	0.939	0.923
4	13	28	0.31	0.14	0.938	0.921
5	16	34	0.31	0.15	0.936	0.921
6	20	42	0.30	0.14	0.936	0.921
7	22	49	0.32	0.14	0.936	0.921

^aThe scale was not optimized but used for conventional DC and AC calculation. ^bThe scale was optimized for DC and AC calculated from without preprocessed RRI.