Key result
Sampling RR intervals at 4 Hz yields reliable HRV spectral estimates for studying autonomic regulation.
A sampling frequency of 4 Hz is recommended for interpolating RR interval time series in spectral analysis of heart rate variability to optimize computational efficiency and accuracy.
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May support efficient HRV spectral analysis in autonomic studies; leaves open prospective validation before routine adoption.
Singh et al. (2004) studied Heart rate variability (HRV) analysis. RR interval sampling frequency (e.g., 4 Hz) vs. Other sampling frequencies was evaluated on Error introduced in selected frequency-domain measures of HRV. A sampling frequency of 4 Hz for RR interval series is appropriate for studying autonomic regulation, enabling reliable spectral estimates between dc and 1 Hz.
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