Table 2.
HRV at baseline and after exercise in people with fibromyalgia.
| Variable | Baseline Mean (SD) |
Post-Exercise Mean (SD) |
p-Value | Z | Effect Size |
|---|---|---|---|---|---|
| Maximum HR | 82.29 (12.08) | 87.62 (12.18) | 0.002 | −3.114 | 0.864 |
| mean HR | 74.86 (10.68) | 75.77 (9.47) | 0.009 | −2.609 | 0.724 |
| RR | 818.43 (125.90) | 803 (108.45) | 0.006 | −2.726 | 0.756 |
| SDNN | 30.35 (20.63) | 31.15 (10.74) | 0.196 | −1.293 | 0.359 |
| pNN50 | 9.25 (14.07) | 5.41 (5.94) | 0.944 | −0.070 | 0.019 |
| RMSSD | 26.93 (17.64) | 29.31 (16.03) | 0.421 | −0.804 | 0.223 |
| Stress Index | 17.11 (7.13) | 13.68 (4.87) | 0.108 | −1.609 | 0.446 |
| PNS Index | −2.93 (9.22) | −0.87 (0.73) | 0.944 | −0.070 | 0.019 |
| SNS Index | 1.77 (1.60) | 1.30 (1.08) | 0.753 | −0.315 | 0.087 |
| VLF | 11.59 (9.59) | 9.82 (5.46) | 0.055 | −1.922 | 0.533 |
| LF | 60.56 (18.44) | 62.68 (15.32) | 0.028 | −2.201 | 0.610 |
| HF | 27.21 (15.93) | 27.34 (15.70) | 0.249 | −1.153 | 0.320 |
| LF/HF | 4.82 (9.17) | 4.64 (5.33) | 0.075 | −1.782 | 0.494 |
| SD1 | 19.08 (12.52) | 20.75 (11.33) | 0.421 | −0.804 | 0.223 |
| SD2 | 38.08 (27.03) | 38.02 (13.13) | 0.184 | −1.328 | 0.368 |
| SampEn | 1.67 (0.36) | 1.47 (0.42) | 0.006 | −2.760 | 0.765 |
Maximum HR: The heart rate peak obtained in the register; Mean HR: the average heart rate obtained in the register; RR: Time between intervals R-R; SDNN: standard deviation of all RR intervals; pNN50: Percentage of intervals >50 ms different from the previous interval; RMSSD: the square root of the mean of the squares of the successive differences of the interval RR; VLF: Very low frequency; LF/HF: Low frequency (LF) ratio (ms2)/High frequency (HF) (ms2); Total power: The sum of all the spectra; PNS index: Parasympathetic nervous system index, SNS index: Sympathetic nervous system index and stress index; SD1: Dispersion, standard deviation of points perpendicular to the axis of line-of-identity in the Poincaré plot; SD2: Dispersion, standard deviation of points along the axis of line-of-identity in the Poincaré plot; SampEn: Sample Entropy.