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Interobserver reproducibility is high for time domain and power spectral measures of heart rate variability, with greater reproducibility for low-frequency measures, and especially for the standard deviation of the 5-minute RR intervals over 24 hours, than for high-frequency measures. Overall interobserver variability of < 8% for these measures is largely (50% to 75%) explained by interobserver differences in annotation of supraventricular ectopy and sinus arrhythmia.
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