The minimum number of RR intervals required for reproduce several metrics derived from HRV (e.g., HF power) can be found in the literature (Richards et al., 2010). However, what about PPG signals and the Pulse Rate Variability? Since PPG was proposed as a surrogate of ECG for the analysis of HRV, is there a minimum number of PP intervals required for reliable and accurate derivation of the PRV?
Probably the minimum number of pp intervals should be same as the minimum number of RR intervals. It is necessary to register at least 250 cardiocycles, since for spectral digital analysis and for calculating the Fourier distribution, the order of the processed numbers should be at least 250.
There is no difference between the number of PP and RR intervals to perform short-term HRV analysis. Both types of information represent essentially the same process - time intervals between heart contractions. As to the number of intervals needed for the analysis, it depends on what HRV parameters you want to calculate. For frequency-domain analysis, it would be more accurate to determine the length of recording in seconds rather than the number of intervals due to the nature of spectral analysis (assumed that FFT analysis will be used). It should be enough to record PP intervals for 5 minutes to estimate HF and LF. But it would be better to record intervals for 10 or more minutes to reliably estimate VLF.
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