Table 4. Heart rate mean and variability in OSA and sleep stages, in basal and CPAP studies.

	WAKE		Non-REM		REM
	HRM	HRV (ms)	HRM	HRV (ms)	HRM	HRV (ms)
Basal	73*	0.0837	63	0.1060	64	0.0909
CPAP	71**	0.0919	62	0.0490***	62	0.0610
T	−0.656	−0.530	−0.944	2.283	1.565	1.565
p value	0.516	0.600	0.352	0.029	0.127	0.127

HRM: Heart Rate Mean. HRV: Heart Rate Variability.

Comparing basal and CPAP studies in the 3 situations, only HRV during non-REM was found to be lower in CPAP studies compared to basal studies. In the basal studies, HRM was higher in Wake (*) than in non-REM or REM. HRV was similar in the three situations. In the CPAP studies, HRM (**) was also higher in WAKE than in non-REM or REM. HRV was lower in non-REM (***), compared to REM and wakefulness.