Table 2.
Probability and test power for each resting heart rate variability parameter. Under the analysis of covariance relevant difference.
| Variable | Group | Mean ± sd | p= | Cohen’s d | Power (1 − ß) | Smallest Worthwhile Change (Threshold) |
|---|---|---|---|---|---|---|
| Mean RR (ms) | CON | 910.0 ± 113.9 | 0.796 | −0.248 | 0.99 | 45.3 |
| HICT | 965.3 ± 251.7 | |||||
| SDNN (ms) | CON | 50.4 ± 19.3 | 0.587 | −0.368 | 0.99 | 5.5 |
| HICT | 59.2 ± 25.3 | |||||
| Mean HR (bpm) | CON | 66.7 ± 8.6 | 0.710 | −0.033 | 1.00 | 6.3 |
| HICT | 67.4 ± 23.5 | |||||
| SDHR (bpm) | CON | 3.8 ± 1.2 | 0.642 | −0.218 | 0.99 | 1.4 |
| HICT | 4.6 ± 4.5 | |||||
| Min HR (bpm) | CON | 58.4 ± 5.1 | 0.236 | 0.225 | 1.00 | 3.0 |
| HICT | 55.8 ± 13.1 | |||||
| Max HR (bpm) | CON | 82.6 ± 12.3 | 0.593 | 0.053 | 0.99 | 7.6 |
| HICT | 81.4 ± 25.2 | |||||
| RMSSD (ms) | CON | 47.2 ± 28.4 | 0.983 | −0.552 | 0.98 | 8.4 |
| HICT | 66.5 ± 37.2 | |||||
| NN50 (beats) | CON | 71.3 ± 67.0 | 0.375 | −0.212 | 1.00 | 20.4 |
| HICT | 85.6 ± 67.6 | |||||
| pNN50 (%) | CON | 23.3 ± 24.0 | 0.109 | −0.318 | 1.00 | 8.4 |
| HICT | 31.4 ± 25.7 | |||||
| LF (n.u.) | CON | 58.7 ± 23.6 | 0.205 | 0.136 | 1.00 | 6.7 |
| HICT | 55.6 ± 22.7 | |||||
| HF (n.u.) | CON | 41.2 ± 23.6 | 0.204 | −0.136 | 1.00 | 6.7 |
| HICT | 44.3 ± 22.7 | |||||
| Total power (ms2) | CON | 2657.2 ± 1837.3 | 0.787 | −0.487 | 1.00 | 935.1 |
| HICT | 7506.1 ± 11,630.5 | |||||
| LF/HF | CON | 2.2 ± 1.9 | 0.623 | −0.053 | 1.00 | 1.3 |
| HICT | 2.3 ± 2.5 |
Abbreviations: Mean RR—Mean inter-beat intervals length, SDNN—the standard deviation of beat-to-beat, Mean HR—Mean heart rate, SDHR—standard deviation of heart rate, Min HR—minimum heart rate, Max HR—maximal heart rate, RMSSD—root mean square of the successive differences, NN50—total successive beats with >50 ms of difference, pNN50—relative successive beats with >50 ms of difference, LF—Low-Frequency domain, HF—High-Frequency domain, LF/HF—Low-to-High Frequency domain ratio, ms—milliseconds, bpm—beats per minute, n.u.—normal units.