Table 2.
Heart rate and heart rate variability measures derived from 24-h recordings during control and experimental days.
| Magnitude of changes between days | |||||
|---|---|---|---|---|---|
| Control day | Experimental day | p | Δ%;%90 CL | ES | |
| HR (bpm) | 71.9±8.0 | 78.8±11.7a | 0.03 | 7.4;±4.1 | 0.49 |
| RMSSD (ms) | 41.8±16.9 | 41.5±16.7 | 0.95 | −0.7;±8.1 | 0.01 |
| SDNN (ms) | 96.9±26.1 | 93.7±25.3 | 0.62 | −3.2;±10.5 | 0.12 |
| LnLF (ms2) | 7.3±0.6 | 7.2±0.5 | 0.91 | −8.0;±618 | 0.03 |
| LnHF (ms2) | 6.2±0.8 | 5.9±0.8a | 0.02 | 39.2;±567 | 1.01 |
| SD1 (ms) | 29.9±12.5 | 29.4±11.9 | 0.90 | −1.4;±5.8 | 0.03 |
| SD2 (ms) | 132.9±34.8 | 128.7±34.3 | 0.60 | −3.2;±13.9 | 0.12 |
| SampEn | 1.01±0.09 | 0.96±0.18 | 0.17 | −5.1;±0.06 | 0.35 |
| α1 | 1.35±0.14 | 1.34±0.16 | 0.81 | −0.6;±0.06 | 0.06 |
| α2 | 0.99±0.08 | 0.93±0.08a | 0.00 | −5.8;±0.03 | 0.75 |
HR, heart rate; RMSSD, root mean square of successive differences between normal sinus R-R intervals; SDNN, standard deviation of all R-R intervals; LnLF, natural log of the Low Frequency component; LnHF, natural log of the High Frequency component; SD1, short-term beat-to-beat R-R variability from the Poincaré plot; SD2, long-term beat-to-beat variability from the Poincaré plot; SampEn, sample entropy; α1, detrended fluctuations of short-term fractal scaling; α2, detrended fluctuations of long-term fractal scaling. %Δ: percentage difference between days; CL: confidence limits; ES: effect size;
a
: p < 0.05 vs. Control day.