Journal
DEVELOPMENTAL PSYCHOBIOLOGY
Volume 48, Issue 3, Pages 197-208Publisher
WILEY
DOI: 10.1002/dev.20129
Keywords
psychobiology; development; stability; infant; autonomic nervous system; Latino
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Funding
- NIEHS NIH HHS [2 P01 ES009605-06] Funding Source: Medline
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The purpose of this study was to develop a standardized protocol to measure preejection period (PEP), a measure of sympathetic nervous system, and respiratory sinus arrhythmia (RSA), a measure of parasympathetic nervous system, during resting and challenging states for 6- and 12-month-old infants and to determine developmental changes and individual stability of these measures. A 7-min reactivity protocol was administered to Latino infants at 6 months (n = 194) and 12 months (n = 181). Results showed: (1) it is feasible to measure PEP and RSA in infants, (2) the protocol elicited significant autonomic changes, (3) individual resting autonomic measures were moderately stable from 6 to 12 months, but reactivity measures were not stable, and (4) heart rate and RSA resting and challenge group means changed significantly from 6 to 12 months. Findings suggest that although infants' autonomic responses show developmental changes, individuals' rank order is stable front 6 to 12 months of age. (c) 2006 Wiley Periodicals, Inc.
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