Cry threshold predicts regulatory disorder in newborn infants.
Studied the autonomic regulation of 37 infants with a typical cry threshold and 17 infants with a high cry threshold (typical of problems in nervous system function). Infants with a high cry threshold had a longer latency to cry, a shorter first cry sound, and a shorter overall bout of crying. Spectrum analysis of 2 hours of heart rate variability showed that a high cry threshold was predictive of fewer reliable rhythms and a lower power of the basic 40-min rhythm in heart rate. High cry threshold infants also showed fewer startles and changes in behavioral state. Results suggest a high cry threshold predicts disrupted autonomic regulation and poor coordination among rhythmic systems affecting cardiac activity.
Zeskind
P S
PS
Virginia Polytechnic Institute and State University, USA.
Marshall
T R
TR
Goff
D M
DM
D001342:Autonomic Nervous System Diseases / Q000503:physiopathology*; D003448:Crying / Q000502:physiology*; D004562:Electrocardiography; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006706:Homeostasis / Q000502:physiology*; D006801:Humans; D018730:Infant Behavior; D007231:Infant, Newborn / Q000502:physiology*; D008297:Male; D011237:Predictive Value of Tests; D011930:Reaction Time; D012684:Sensory Thresholds