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Journal of Pediatric Psychology 21(6) pp. 803-819, 1996
© 1996 Society of Pediatric Psychology

research-article

Cry Threshold Predicts Regulatory Disorder in Newborn Infants1

Philip Sanford Zeskind2,, Timothy R. Marshall and Dennis M. Goff

Virginia Polytechnic Institute and State University, Christopher Newport University, Randolph Macron Woman's College

2All correspondence should be addressed to Sandy Zeskind, Department of Pediatrics, Carolinas Medical Center, P O. Box 32861, Charlotte, North Carolina 28232-2861

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 rale 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.

Key words: newborn infants; crying; heart rate; rhythms; assessment.


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