Table 2.
Time domain and frequency domain analysis.
| Variable | Day 1 (acute phase) | Day 2 (early recovery) | Day 3 (full recovery) |
|---|---|---|---|
| Time domain results | |||
| μRR (ms) | 409.2 | 609.8 | 877.7 |
| STD RR (ms) | 5.4 | 17.3 | 34.3 |
| RMSSD (ms) | 1.2 | 4.8 | 24.8 |
| NN50 (count) | 0 | 0 | 21 |
| pNN50 (%) | 0 | 0 | 6.2 |
| Frequency domain results | |||
| Total power (ms2) | 25 | 294 | 1,120 |
| VLF (ms2) | 23 | 159 | 529 |
| LF (ms2) | 2 | 121 | 273 |
| HF (ms2) | 0 | 14 | 318 |
| LF/HF | 8.22 | 8.87 | 0.86 |
μRR, mean R-to-R interval; STD RR, standard deviation of R-to-R intervals; RMSSD, root mean square of successive R-to-R interval differences; NN50, number of successive intervals differing more than 50 ms; pNN50, percentage of successive intervals differing more than 50 ms; VLF, very low frequency band density; LF, low frequency band density; HF, high frequency band density.