Table 2.

HRV parameters under conditions of intermittent hypoxia and normoxia

HRV Parameter	Normoxia	Intermittent Hypoxia	P Value
Average R-R interval, ms	919.9 (41.0)	874.4 (26.5)	0.04
SDNN, ms	93.3 (6.5)	107.8 (5.1)	0.009
VLF power, ms2	4,460.2 (729.3)	9,284.8 (1,408.3)	<0.0001
LF power, ms2	3,534.2 (332.1)	4,450.2 (620.1)	0.047
HF power, ms2	1,968.8 (314.3)	1,839.7 (228.5)	0.53
LF/(LF + HF)	0.64 (0.04)	0.69 (0.04)	0.07

Values are means (SE). HRV, heart rate variability; SDNN, SD of total normal R-R intervals; VLF, very-low-frequency power; LF, low-frequency power; HF, high-frequency power; LF/(LF + HF), normalized LF power.