Table 2.
Poincaré plot and spectral analysis of R-R intervals (n = 17) during rest for the contraindicated assessment (one or more external stressors present) vs. the repeat assessment (no external stressors present).
| Parameter | Contraindicated | Repeat | t-statistic | Cohen's D | p-value |
|---|---|---|---|---|---|
| SDNN* (ms) | 53 ± 18 | 68 ± 20 | −2.50 | −0.61 | 0.02 |
| SD1 (ms) | 30 ± 18 | 36 ± 18 | −1.53 | −0.37 | 0.15 |
| SD2* (ms) | 68 ± 22 | 88 ± 25 | −2.62 | −0.64 | 0.02 |
| SDNNd* (ms) | 37 ± 12 | 47 ± 14 | −2.52 | −0.61 | 0.02 |
| SDNNa* (ms) | 38 ± 14 | 48 ± 14 | −2.46 | −0.60 | 0.03 |
| SD1d (ms) | 22 ± 13 | 26 ± 13 | −1.39 | −0.34 | 0.20 |
| SD1a (ms) | 20 ± 12 | 25 ± 12 | −1.70 | −0.41 | 0.11 |
| SD2d* (ms) | 47 ± 13 | 61 ± 16 | −2.69 | −0.65 | 0.01 |
| SD2a* (ms) | 49 ± 18 | 63 ± 19 | −2.55 | −0.62 | 0.02 |
| LF (ms2) | 7 ± 6 | 10 ± 6 | −1.72 | −0.42 | 0.10 |
| HF (ms2) | 6 ± 8 | 8 ± 10 | −1.93 | −0.47 | 0.07 |
| LF/HF | 5 ± 5 | 3 ± 2 | 1.56 | 0.38 | 0.14 |
| Total Power* (ms2) | 18 ± 13 | 34 ± 27 | −2.62 | −0.64 | 0.02 |
* (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.