Intrauterine exposition to smoking and autonomic nervous system function during sleep

The way sleep development might influence cardiac autonomic control of preterm and term neonates has been a subject of much investigation since the first studies by Curzi-Dascalova and collaborators. It is well known that active sleep differs from quiet sleep by higher indexes of central apneas, faster respiratory and heart rates. Additional findings are, under parasympathetic influence, a lower amplitude of high frequency heart rate variability and, under sympathetic influence, a higher amplitude of low frequency heart rate variability.

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