Application of the Lomb-Scargle Periodogram to InvestigateHeart Rate Variability during Haemodialysis

Figure 7

Each point represents the mean-average of spectral parameters (derived from valid PSD estimates) over a 20-minute period. It presents the results from the first 80 minutes of a dialysis treatment, and it can be seen that different trends arise from different methods of processing the RR tachogram. (a) 20-minute average of LF results. (b) 20-minute average of HF results. (c) 20-minute average of LF/HF results.

(a)

(b)

(c)