Abstract
Measures of respiratory sinus arrhythmia (RSA) in R-R intervals were calculated from a 5-min recording of 3- to 6-month-old full-term infants. The reliability of the measures was estimated with Cronbach's α for sampling durations of 5, 15, 25, or 60 s, for single or multiple samples from each of the five baseline periods. Reliability of RSA was good (>.8) for samples of 25 s or greater but decreased with smaller sampling durations. The sensitivity of the measures in detecting an age effect between 14-, 20-, and 26 week-old infants correlated positively with the reliability of the measure. This study suggests that reliability of RSA measures in young infants is acceptable.
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