Detection of a and b waves in the acceleration photoplethysmogram

Table 1 A rigorous optimization over all parameters of the a wave detection algorithm: frequency band, W ₁ , W ₂ , and the offset β

Iterations	Frequency band	W ₁	W ₂	Offset (%)	SE (%)	+P (%)	Overall accuracy (%)
1	0.5–15 Hz	35	200	0	99.72	100.00	99.86
2	0.5–11 Hz	25	200	0	99.92	99.78	99.85
3	1–15 Hz	35	200	0	99.68	100.00	99.84
4	0.5–13 Hz	35	200	0	99.67	100.00	99.84
5	0.5–14 Hz	20	220	0	100.00	99.64	99.82
6	1–14 Hz	35	200	0	99.64	100.00	99.82
7	0.5–14 Hz	20	200	0	99.92	99.71	99.82
8	0.5–14 Hz	20	210	0	99.92	99.71	99.82
9	0.5–13 Hz	25	200	0	99.84	99.78	99.81
10	1–14 Hz	25	200	0	99.84	99.78	99.81
11	1–14 Hz	25	210	0	99.84	99.78	99.81
12	0.5–13 Hz	20	200	0	99.92	99.66	99.79
13	1–15 Hz	30	200	0	99.75	99.82	99.79
14	0.5–15 Hz	30	200	0	99.68	99.89	99.78
15	1–9 Hz	35	200	0	99.55	100.00	99.78
16	0.5–12 Hz	25	220	0	100.00	99.55	99.78
17	0.5–14 Hz	35	200	0	99.54	100.00	99.77
18	1–15 Hz	30	250	0	99.75	99.79	99.77
19	0.5–15 Hz	25	200	0	99.92	99.61	99.76
20	0.5–12 Hz	25	200	0	99.84	99.68	99.76
.	.	.	.	.	.	.
.	.	.	.	.	.	.
.	.	.	.	.	.	.
5606	0.5–8 Hz	40	230	10	90.22	99.88	95.05
5607	0.5–7 Hz	40	230	9	89.80	99.88	94.84
5608	0.5–7 Hz	40	240	9	89.96	99.68	94.82
5609	0.5–7 Hz	40	230	10	89.21	99.88	94.55
5610	0.5–7 Hz	40	240	10	89.38	99.68	94.53

All possible combinations of parameters (5,610 iterations) have been investigated and sorted in descending order according to their overall accuracy. The data used in this training phase were PPG measured after 1 hour of exercise, with 885 heartbeats. The overall accuracy is the average value of SE and +P.

ISSN: 1475-925X