Extraction of Heart Rate Variability from Smartphone Photoplethysmograms

Table 4

Comparison of five algorithms for detection of characteristic points.

Parameter	PP	VP	M1D	M2D	TI
AVNN
Bias	*	—	—	*	—
SD	—	—	—	*	*
TP
Bias	—	*	—	*	—
SD	—	—	—	*	*
VLF
Bias	—	—	*	—	*
SD	—	—	*	*	—
LF
Bias	*	—	*	—	—
SD	—	—	—	*	*
HF
Bias	—	*	—	*	—
SD	—	—	*	*	—
LF/HF
Bias	—	—	—	*	*
SD	—	—	—	*	*
nLF
Bias	—	—	—	*	*
SD	—	—	*	*	—
nHF
Bias	—	—	—	*	*
SD	—	—	—	*	*
SD2
Bias	—	—	*	—	*
SD	—	—	*	—	*
Total stars	2	2	7	14	11

PP: peak point, VP: valley point, M1D: maximum first derivative, M2D: maximum second derivative, and TI: tangent intersection. SD: standard deviation. HRV parameters are explained in Table 1.