Table 2.
Percentage errors of heart rate variability (HRV) measurements in short-term acquisitions.
| Error% | Segment 1 | Segment 2 | Segment 3 |
|---|---|---|---|
| Mean ± std.dev. | Mean ± std.dev. | Mean ± std.dev. | |
| NN/RR ratio | 0.10 ± 0.16 | −0.01 ± 0.12 | −0.03 ± 0.09 |
| AVNN | 0.06 ± 0.04 | 0.06 ± 0.02 | 0.06 ± 0.02 |
| SDNN | 0.23 ± 0.57 | 0.16 ± 0.55 | 0.19 ± 0.88 |
| rMSSD | 0.23 ± 3.00 | 0.41 ± 3.15 | 0.27 ± 2.81 |
| pNN50 | 0.22 ± 9.98 | 6.05 ± 15.57 | 4.89 ± 12.85 |
| LF power | −0.76 ± 2.83 | −1.74 ± 2.74 | −0.86 ± 2.16 |
| HF power | 3.37 ± 5.64 | 3.82 ± 4.68 | 3.84 ± 5.56 |
| LF/HF ratio | −3.85 ± 3.55 | −5.22 ± 4.25 | −4.30 ± 5.21 |
| SD1 | −1.07 ± 2.58 | 0.44 ± 3.20 | 0.34 ± 2.72 |
| SD2 | −0.00 ± 0.41 | 0.06 ± 0.46 | 0.17 ± 0.39 |
NN: normal sinus to normal sinus; AVNN: average of all NN intervals; SDNN: standard deviation of all NN intervals; rMSSD: square root of the mean of the squares of differences between adjacent NN intervals; pNN50: percentage differences between adjacent NN intervals greater than 50 ms; LF: low frequency; HF: high frequency; SD: standard deviations.