Heart rate control in normal and aborted-SIDS infants.

@article{Pincus1993HeartRC,
  title={Heart rate control in normal and aborted-SIDS infants.},
  author={Steven M. Pincus and Theodore R. Cummins and Gabriel G. Haddad},
  journal={The American journal of physiology},
  year={1993},
  volume={264 3 Pt 2},
  pages={R638-46}
}
Approximate entropy (ApEn), a mathematical formula quantifying regularity in data, was applied to heart rate data from normal and aborted-sudden infant death syndrome (SIDS) infants. We distinguished quiet from rapid-eye-movement (REM) sleep via the following three criteria, refining the notion of REM as more "variable": 1) REM sleep has greater overall variability (0.0374 +/- 0.0138 vs. 0.0205 +/- 0.0090 s, P < 0.005); 2) REM sleep is less stationary (StatAv = 0.742 +/- 0.110) than quiet sleep… CONTINUE READING