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

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.