title: Reproducibility of resting heart rate variability with short sampling periods.
abstract: The purpose of this study was to determine whether resting heart rate variability (HRV) is reproducible with short sampling measurement periods using an office-based personal computer measurement system. Eight healthy active women participated in ECG analyses on 2 days within 1 week under controlled environmental and physiological conditions. After they rested for 10 minutes, a 10-min ECG was recorded. HRV was determined from a 2.5- and 5-min sample period using both time domain variables (meanRR and SDNN) and frequency domain variables (LF, HF, LF:HF). Repeated measures ANOVA found no significant differences between Day 1 and Day 2 for either sampling period (p > or = 0.23). For both the 2.5- and 5-min sampling periods, the intraclass correlations between days for the time domain variables showed good reproducibility (R = 0.86-0.90). The reproducibility of the frequency domain variable was only average (R = 0.67-0.96), with the LF:HF ratio yielding the higher R values.
authors.affiliation: Dept. of Exercise & Sport Science, UNC-Chapel Hill 28223-0001, USA.
authors.forename: B L
authors.initials: BL
authors.lastname: Marks
authors.forename: J T
authors.initials: JT
authors.lastname: Lightfoot
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D004562:Electrocardiography; D005260:Female; D005583:Fourier Analysis; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008838:Microcomputers; D015203:Reproducibility of Results; D012815:Signal Processing, Computer-Assisted