Temporal asymmetries of short-term heart period variability are linked to autonomic regulation

39 subjects total, comprising 22 healthy fetuses (16th to 40th week of gestation) and 17 healthy humans (aged 21 to 54, median=28).

Time reversibility analysis of short-term heart period variability during graded head-up tilt (15, 30, 45, 60, 75, 90 degrees) in adults and observational monitoring in fetuses.

Supine position at rest (adults) and earlier gestational age (fetuses).

Temporal asymmetries and reversibility indexes of short-term heart period variability.surrogate