Table 3.
HRV variables in the time and frequency domains.
| Variables | Whole-body HIIT (n = 10) |
Control (n = 11) |
||
|---|---|---|---|---|
| Pre | Post | Pre | Post | |
| Time domain | ||||
| SDNN (ms) | 50.95 ± 37.17 | 73.40 ± 40.70∗∗ | 55.07 ± 25.14 | 54.43 ± 25.96 |
| RMSSD (ms) | 54.45 ± 56.04 | 81.26 ± 60.14∗ | 57.62 ± 30.61 | 59.59 ± 31.63 |
| Frequency domain | ||||
| LF (ms2) | 662.43 ± 459.25 | 1318.59 ± 1666.54 | 954.94 ± 1067.34 | 819.33 ± 829.23 |
| LF (n.u.) | 37.95 ± 27.54 | 32.94 ± 24.35 | 33.08 ± 24.91 | 28.95 ± 19.71 |
| HF (ms2) | 2767.93 ± 5028.54 | 4051.48 ± 4984.48 | 2404.96 ± 2820.61 | 2449.66 ± 2398.32 |
| HF (n.u.) | 61.67 ± 27.64 | 66.59 ± 24.23 | 66.77 ± 24.81 | 70.82 ± 19.60 |
| LF/HF ratio | 2.20 ± 4.93 | 1.38 ± 3.08 | 1.02 ± 1.44 | 0.65 ± 0.82 |
Values are presented as mean ± SD.
HF: high-frequency band (0.15–0.4 Hz), HRV: heart rate variability, LF: low-frequency band (0.04–0.15 Hz), LF/HF: ratio of LF to HF power, RMSSD: root mean square of successive RR interval difference, SDNN: standard deviation of NN interval.
∗∗p = 0.001 for the time × group interaction effect.
∗p = 0.019 for the time × group interaction effect.