Table 1.
Spectral analysis of instantaneous pulse rate variability (iPRV) during different physiologic challenges
| LF (ms2) | HF (ms2) | VHF (ms2) | |
|---|---|---|---|
| Baseline |
1161+/−1841 |
2223+/−2563 |
1258+/−1244 |
| 6-cycle |
8522+/−5865§ |
1468+/−1424 |
2080+/−2395 |
| 30-cycle |
897+/−822 |
898+/−1021 |
2333+/−2346§ |
| HUT | 802+/−624 | 1196+/−1397* | 939+/−671 |
Present form is mean +/− SD with n = 15; *means p < 0.05 compared with baseline; §means p < 0.01 compared with baseline.
LF denotes low frequency band (0.04-0.15 Hz); HF denotes high frequency band (0.15-0.4 Hz); VHF denotes very high frequency band (0.4-0.9 Hz); 6-cycle denotes paced respiration with 6 cycles per minute; 30-cycle denotes paced respiration with 30 cycles per minute; HUT denotes head-up tilt.