Key result
Autonomic responses in Latino infants showed significant developmental changes from 6 to 12 months of age, while individual resting autonomic measures remained moderately stable.
Cohort (n=194)
Resting autonomic measures (PEP and RSA) in infants show developmental changes but maintain individual rank-order stability from 6 to 12 months of age.
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Autonomic patterns in Latino infants may refine developmental norms; leaves open predictive links to later cardiovascular risk.
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 from 6 to 12 months of age.
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Alkon et al. (2006) conducted a cohort in Healthy infants (n=194). 7-min reactivity protocol vs. Resting state was evaluated on Developmental changes and individual stability of preejection period (PEP) and respiratory sinus arrhythmia (RSA). Autonomic responses in Latino infants showed significant developmental changes from 6 to 12 months of age, while individual resting autonomic measures remained moderately stable.
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