Table 4.

$\frac{\mathrm{L}\mathrm{F}}{\mathrm{H}\mathrm{F}}$-ratios during Wakefulness, NREM and REM sleep. N/A = not available, Post-MI = a few days after myocardial infarction, CNS = non-cardiac related problem. Results quoted from (Otzenberger et al. 1998, Vanoli et al. 1995, Lavie et al. 1999).

Activity → Condition ↓	Population Size	Awake	REM Sleep	NREM Sleep
Normal (Otzenberger et al. 1998)	15	N/A	[2 : 2.5]	[0.5 : 1]
Normal (Vanoli et al. 1995)	16	4.0 ± 1.4	3.1 ± 0.7	1.2 ± 0.4
CNS Problem (Lavie et al. 1999)	22	N/A	[3.5 : 5.5]	[2 : 3.5]
Post-MI (Vanoli et al. 1995)	16	2.4 ± 0.7	8.9 ± 1.6	5.1 ± 1.4