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. 2018 May 4;97(18):e0639. doi: 10.1097/MD.0000000000010639

Figure 1.

Figure 1

Power spectra of respiratory, RR interval signal during controlled respiration at 16 and 8 breaths per minute in 1 subject. 0.15 Hz is the conjunction between LF band and HF band of HRV of traditional spectral analysis at breathing rate of 16 breaths per minute (A) and 8 breaths per minute (B). We use Central Frequency of Respiration Peak at 0.65 Hz to correct the conjunction between LF band and HF band of HRV of corrected spectral analysis at breathing rate of 16 breaths per minute (a) and 8 breaths per minute (b). F = frequency, HF = high-frequency, HRV = heart rate variability, LF = low-frequency, PSD = power spectrum densities, Resp = respiration, rri = R-R interval.