Table 8.
Correlation coefficients (p-value) between changes (Δ%) in 24-h HRV parameters (control vs. experimental day) and physical fitness variables.
| ΔSDNN | ΔRMSSD | ΔLnLF | ΔLnHF | ΔSD1 | ΔSD2 | ΔSampEn | |
|---|---|---|---|---|---|---|---|
| BMI | 0.59 (0.00) | 0.61 (0.00) | 0.54 (0.02) | 0.53 (0.02) | 0.61 (0.00) | 0.59 (0.00) | −0.19 (0.39) |
| MAS | −0.27 (0.22) | −0.32 (0.14) | −0.031 (0.17) | −0.53 (0.02) | −0.32 (0.14) | −0.26 (0.24) | −0.02 (0.92) |
| TUMTT | −0.28 (0.21) | −0.32 (0.14) | −0.32 (0.17) | −0.52 (0.02) | −0.33 (0.13) | −0.27 (0.23) | −0.03 (0.91) |
| BF | 0.39 (0.07) | 0.48 (0.02) | 0.34 (0.14) | 0.54 (0.02) | 0.49 (0.02) | 0.37 (0.09) | −0.12 (0.59) |
| MS | −0.00 (0.99) | 0.10 (0.69) | −0.34 (0.14) | −0.30 (0.23) | 0.07 (0.74) | −0.01 (0.96) | 0.32 (0.14) |
BMI, body mass index; MAS, maximal aerobic speed; TUMTT, Time to complete the Université de Montreal Track Test; BF, body fat; MS, muscular strength; SDNN, standard deviation of all R-R intervals; RMSSD, root mean square of successive differences between normal sinus 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.