title: The interpretation of very high frequency band of instantaneous pulse rate variability during paced respiration.
abstract: BACKGROUND
  Pulse rate (PR) indicates heart beat rhythm and contains various intrinsic characteristics of peripheral regulation. Pulse rate variability (PRV) is a reliable method to assess autonomic nervous system function quantitatively as an effective alternative to heart rate variability. However, the frequency range of PRV is limited by the temporal resolution of PR based on heart rate and it is further restricted the exploration of optimal autoregulation frequency based on spectral analysis.
  
  
  METHODS
  Recently, a new novel method, called instantaneous PRV (iPRV), was proposed. iPRV breaks the limitation of temporal resolution and extends the frequency band. Moreover, iPRV provides a new frequency band, called very high frequency band (VHF; 0.4-0.9 Hz).
  
  
  RESULTS
  The results showed that the VHF indicated the influences of respiratory maneuvers (paced respiration at 6-cycle and 30-cycle) and the nonstationary condition (head-up tilt; HUT).
  
  
  CONCLUSIONS
  VHF is as a potential indication of autoregulation in higher frequency range and with peripheral regulation. It helps for the frequency exploration of cardiovascular autoregulation.
authors.forename: Chia-Chi
authors.initials: CC
authors.lastname: Chang
authors.forename: Hung-Yi
authors.initials: HY
authors.lastname: Hsu
authors.affiliation: Biomedical Electronics Translational Research Center and Biomimetic Systems Research Center, National Chiao Tung University, Taiwan, ROC. labview@cs.nctu.edu.tw.
authors.forename: Tzu-Chien
authors.initials: TC
authors.lastname: Hsiao
mesh_terms: D000328:Adult; D001794:Blood Pressure; D006334:Heart Function Tests / Q000379:methods*; D006339:Heart Rate; D006801:Humans; D008297:Male; D012119:Respiration; D012815:Signal Processing, Computer-Assisted
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