Table 11.

Typical HRV measures after applying cubic spline interpolation and the proposed algorithms for various gap sizes, compared to the HRV measures in the original signal for Participant 1 (NEEDED database).

Signal	Method	RMSSD	SDNN	SDSD	Total Power	LF	HF	SD1	SD2	Mean Error
Original		2.32	12.95	2.39	45.96	6.67	4.91	1.64	18.25
Gap w = 3	Cubic spline	2.28	12.95	2.29	45.38	6.59	4.38	1.61	18.24	2.4%
	Algorithm 2	2.29	12.96	2.30	45.56	6.60	4.56	1.62	18.26	1.7%
	(StDev.)	(153 × 10${}^{-5}$)	(6.73 × 10${}^{-6}$)	(1.55 × 10${}^{-5}$)	(2.88 × 10${}^{-4}$)	(3.27 × 10${}^{-5}$)	(2.83 × 10${}^{-4}$)	1.09 × 10${}^{-5}$)	(9.03 × 10${}^{-6}$)
Gap w = 5	Cubic spline	2.34	12.96	2.35	47.32	7.00	6.05	1.66	18.25	4.2%
	Algorithm 2	2.27	12.96	2.28	44.83	6.53	3.75	1.61	18.26	4.3%
	(StDev.)	(2.60 × 10${}^{-5}$)	(6.24 × 10${}^{-6}$)	(2.62 × 10${}^{-5}$)	(4.50 × 10${}^{-4}$)	(5.63 × 10${}^{-5}$)	(4.83 × 10${}^{-4}$)	(1.85 × 10${}^{-5}$)	(8.32 × 10${}^{-6}$)
Gap w = 7	Cubic spline	2.18	12.96	2.19	43.69	6.42	2.36	1.55	18.27	9.9%
	Algorithm 2	2.24	12.97	2.24	44.69	6.48	3.55	1.59	18.27	5.6%
	(StDev.)	(4.74 × 10${}^{-5}$)	(1.54 × 10${}^{-5}$)	(4.77 × 10${}^{-5}$)	(5.34 × 10${}^{-4}$)	(8.57 × 10${}^{-5}$)	(5.54 × 10${}^{-4}$)	(3.37 × 10${}^{-5}$)	(2.04 × 10${}^{-5}$)