Table 2.
Baseline heart rate variability (HRV) derived parameters of the study participants.
| All (n = 55) | Exercise (n = 26) | Control (n = 29) | p | |
|---|---|---|---|---|
| Median (IQR) | Median (IQR) | Median (IQR) | ||
| SDNN, ms | 19.59 (13.30–25.80) | 15.87 (11.34–25.24) | 21.42 (14.55–26.36) | 0.376 |
| RMSSD, ms | 16.20 (11.55–25.07) | 14.82 (8.86–24.86) | 17.33 (13.61–26.75) | 0.292 |
| pNN50 (%) | 0.57 (0.21–3.17) | 0.42 (0.22–2.78) | 0.70 (0.22–3.48) | 0.715 |
| LF, ms2 | 164.12 (76.51–340.51) | 157.23 (76.51–345.26) | 198.18 (76.51–345.26) | 0.607 |
| HF, ms2 | 97.20 (39.31–299.42) | 93.65 (29.92–334.81) | 100.37 (59.40–216.69) | 0.607 |
| LFHF | 1.57 (0.93–2.81) | 1.31 (0.83–3.29) | 1.82 (1.08–2.55) | 0.980 |
| SD1, ms | 11.48 (8.18–17.75) | 10.49 (6.27–17.60) | 12.27 (9.64–17.60) | 0.292 |
| SD2, ms | 25.30 (15.54–30.46) | 20.86 (18.28–30.42) | 25.80 (18.29–30.42) | 0.423 |
| SampEn, au | 1.70 (1.55–1.83) | 1.70 (1.60–1.82) | 1.70 (1.51–1.83) | 0.692 |
Values are the median (IQR, interquartile range). HF, high frequency power in absolute value; LF, low frequency power in absolute value; pNN50, percentage of successive normal sinus RR intervals more than 50 ms; RMSSD, root mean square successive difference; SampEn, sample entropy; ms. milliseconds: SD1, standard deviation—poincaré plot crosswise; SD2, standard deviation—poincaré plot lengthwise; SDNN, standard deviation of NN intervals.