Table 4.
Poincaré plot and spectral analysis of R-R intervals (n = 10) during rest for prior exercise only vs. the repeat assessment (no external stressors present).
| Parameter | Exercise Only | Repeat | t-statistic | Cohen's D | p-value |
|---|---|---|---|---|---|
| SDNN* (ms) | 50 ± 20 | 72 ± 20 | −2.7 | −0.85 | 0.02 |
| SD1 (ms) | 26 ± 15 | 36 ± 15 | −1.9 | −0.60 | 0.09 |
| SD2* (ms) | 65 ± 26 | 94 ± 26 | −2.7 | −0.85 | 0.02 |
| SDNNd* (ms) | 35 ± 13 | 50 ± 14 | −2.7 | −0.85 | 0.01 |
| SDNNa* (ms) | 36 ± 16 | 51 ± 15 | −2.7 | −0.85 | 0.02 |
| SD1d (ms) | 19 ± 12 | 26 ± 11 | −1.6 | −0.51 | 0.14 |
| SD1a (ms) | 17 ± 10 | 25 ± 10 | −2.2 | −0.70 | 0.05 |
| SD2d* (ms) | 45 ± 15 | 65 ± 18 | −2.8 | −0.89 | 0.02 |
| SD2a* (ms) | 47 ± 22 | 68 ± 20 | −2.6 | −0.82 | 0.03 |
| LF (ms2) | 7 ± 8 | 11 ± 7 | −1.47 | −0.46 | 0.18 |
| HF* (ms2) | 4 ± 4 | 8 ± 8 | −2.43 | −0.77 | 0.04 |
| LF/HF | 5 ± 4 | 2 ± 2 | 1.52 | 0.48 | 0.16 |
| Total Power* (ms2) | 16 ± 11 | 39 ± 30 | −2.51 | −0.79 | 0.03 |
* (p < 0.05).
SDNN = total variability; SD1 = short-term variability; SD2 = long-term variability; SDNNd = contribution of decelerations to total variability; SDNNa = contribution of accelerations to total variability, SD1d = contribution of decelerations to short-term variability; SD1a = contribution of accelerations to short-term variability; SD2d = contribution of decelerations to long-term variability; SD2a = contribution of accelerations to long-term variability; HF = high frequency; LF = low frequency.