Table 1.
—Power Spectral Measures of Heart Rate Variability With Sleep Fragmentation
| HRV Parameter | Night 1, Nonfragmented | Night 2, Fragmented | Night 3, Fragmented |
| VLF power, ms2 | 4758.5 (466.5) | 5722.5 (393.3)a | 5537.5 (585.7)b |
| LF power, ms2 | 4548.5 (276.5) | 6098.8 (343.1)a | 6356.3 (277.6)a |
| HF power, ms2 | 3346.0 (460.1) | 2950.2 (344.2)b | 2882.8 (319.3)a |
| LF/(LF+HF) | 0.59 (0.04) | 0.68 (0.03)a | 0.69 (0.03)a |
Values reported are mean and (SEM). HF = high frequency; HRV = heart rate variability; LF = low frequency; VLF = very low frequency.
a
P < .001 comparing fragmented with nonfragmented sleep.
b
P < .03 comparing fragmented with nonfragmented sleep.