Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Summary of agreement between HRV derived from ECG and PPG for each type of activity, depending on PPG fiducial point selection with and without correction of outliers_ The agreement is represented as median absolute deviation (MAD), median absolute relative deviation (MARD) and the root mean square error (RMSE)_
| Fiducial point | Outlier correction | HRV | Agreement | Relaxation | Exercise | Mental stress |
|---|---|---|---|---|---|---|
| Foot | Yes | SDNN | MAD | 9,83 | 137,86 | 10,14 |
| Max slope | Yes | SDNN | MAD | 2,25 | 78,82 | 1,19 |
| Foot | No | SDNN | MAD | 28,12 | 290,49 | 26,95 |
| Max slope | No | SDNN | MAD | 21,98 | 272,73 | 17,6 |
| Foot | Yes | RMSSD | MAD | 27,56 | 189,3 | 50,17 |
| Max slope | Yes | RMSSD | MAD | 3,46 | 114,26 | 2,27 |
| Foot | No | RMSSD | MAD | 64,21 | 415,58 | 72,18 |
| Max slope | No | RMSSD | MAD | 41,31 | 369,77 | 27,77 |
| Foot | Yes | SDNN | MARD | 18,00 % | 341 % | 23,20 % |
| Max slope | Yes | SDNN | MARD | 3,60 % | 239 % | 1,80 % |
| Foot | No | SDNN | MARD | 51,50 % | 933 % | 53,90 % |
| Max slope | No | SDNN | MARD | 22,00 % | 877 % | 28,30 % |
| Foot | Yes | RMSSD | MARD | 85,00 % | 1576 % | 156 % |
| Max slope | Yes | RMSSD | MARD | 8,20 % | 647 % | 6,40 % |
| Foot | No | RMSSD | MARD | 152 % | 1727 % | 216 % |
| Max slope | No | RMSSD | MARD | 60,00 % | 1572 % | 79,30 % |
| Foot | Yes | SDNN | RMSE | 21,41 | 202,95 | 27,33 |
| Max slope | Yes | SDNN | RMSE | 14,83 | 184,50 | 8,59 |
| Foot | No | SDNN | RMSE | 85,16 | 403,71 | 60,56 |
| Max slope | No | SDNN | RMSE | 79,17 | 395,91 | 49,43 |
| Foot | Yes | RMSSD | RMSE | 43,17 | 253,67 | 66,01 |
| Max slope | Yes | RMSSD | RMSE | 14,98 | 212,15 | 22,28 |
| Foot | No | RMSSD | RMSE | 143,70 | 552,46 | 126,00 |
| Max slope | No | RMSSD | RMSE | 131,14 | 533,94 | 99,57 |
Summary of agreement between RR derived from ECG and IBI derived from PPG for each type of activity_ The agreement is presented as median absolute deviation (MAD), median absolute relative deviation (MARD) and the root mean square error (RMSE)_
| Fiducial point | Outlier correction | Agreement | Relaxation | Exercise | Mental stress |
|---|---|---|---|---|---|
| Foot | Yes | MAD | 3.97 | 18.93 | 4.71 |
| Max slope | Yes | MAD | 2.82 | 4.34 | 2.29 |
| Foot | No | MAD | 4.03 | 42.40 | 4.46 |
| Max slope | No | MAD | 2.93 | 48.86 | 2.29 |
| Foot | Yes | MARD | 0.51% | 3.24% | 0.69% |
| Max slope | Yes | MARD | 0.36% | 0.67% | 0.35% |
| Foot | No | MARD | 0.58% | 8.02% | 0.62% |
| Max slope | No | MARD | 0.38% | 9.45% | 0.35% |
| Foot | Yes | RMSE | 13.02 | 106.27 | 12.73 |
| Max slope | Yes | RMSE | 8.41 | 99.51 | 6.98 |
| Foot | No | RMSE | 34.03 | 255.14 | 21.85 |
| Max slope | No | RMSE | 35.15 | 262.89 | 14.22 |