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Power spectral density analysis showing frequency domain measures of heart rate variability. Three characteristic peaks are seen corresponding to the low frequency (LF) domain 0.03–0.15 Hz, high frequency domain (HF) 0.15–0.40 Hz and very low frequency (VLF) 0.003–0.04 Hz domain of heart rate variability recordings. Five-minute recording taken from healthy male and analysed using Kubios V3.1 software.
