Table 3.
Frequency and time measurements of the fetal heart rate variability in late gestation and in the immediate perinatal period
| Late Gestation |
Perinatal Period |
|||
|---|---|---|---|---|
| Control | Cortisol | Control | Cortisol | |
| VLF | 0.315 ± 0.010 | 0.297 ± 0.012 | NA | NA |
| LF | 0.135 ± 0.011 | 0.141 ± 0.013 | NA | NA |
| MF | 0.088 ± 0.010 | 0.084 ± 0.009 | NA | NA |
| HF | 0.047 ± 0.006 | 0.060 ± 0.007 | NA | NA |
| VHF | 0.028 ± 0.009 | 0.018 ± 0.007 | NA | NA |
| LF/HF | 3.48 ± 0.319 | 2.88 ± 0.378 | NA | NA |
| SDNN | NA | NA | 0.144 ± 0.020 | 0.198 ± 0.043 |
| RMSSD | NA | NA | 0.449 ± 0.037 | 0.725 ± 0.196 |
| SDNN/RMSSD | NA | NA | 0.314 ± 0.028 | 0.297 ± 0.045 |
Values are group means ± SE. VLF, very low frequency; LF, low frequency; MF, medium frequency; HF, high frequency; VHF, very high frequency; LF/HF, ratio of LF to HF; SDNN, standard deviation of N-N intervals; RMSSD, root mean square of successive differences; SDNN/RMSSD, ratio of SDNN to RMSSD; NA, not applicable.