Abstract
Heart rate variability (HRV) is a well-accepted indicator for neural regulatory mechanisms in cardiovascular circulation. Its spectrum analysis provides the powerful means of observing the modulation between sympathetic and parasympathetic nervous system. The timescale of HRV is limited by discrete beat-to-beat time intervals; therefore, the exploration region of frequency band of HRV spectrum is relatively narrow. It had been proved that pulse rate variability (PRV) is a surrogate measurement of HRV in most of the circumstances. Moreover, arterial pulse wave contains small oscillations resulting from complex regulation of cardiac pumping function and vascular tone at higher frequency range. This study proposed a novel instantaneous PRV (iPRV) measurement based on Hilbert–Huang transform. Fifteen healthy subjects participated in this study and received continuous blood pressure wave recording in supine and passive head-up tilt. The result showed that the very-high-frequency band (0.4–0.9 Hz) varied during head-up tilt and had strong correlation (r = 0.77) with high-frequency band and medium correlation (r = 0.643) with baroreflex sensitivity. The very-high-frequency band of iPRV helps for the exploration of non-stationary autoregulation and provides the non-stationary spectral evaluation of HRV without distortion or information loss.





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- HR:
-
Heart rate
- RRi:
-
Beat-to-beat interval
- ECG:
-
Electrocardiogram
- HRV:
-
HR variability
- ANS:
-
Autonomic nervous system
- SNS:
-
Sympathetic nervous system
- PNS:
-
Parasympathetic nervous system
- FFT:
-
Fast Fourier transform
- LF:
-
Low frequency
- HF:
-
High frequency
- PRV:
-
Pulse rate variability
- HHT:
-
Hilbert–Huang transform
- EMD:
-
Empirical mode decomposition
- IMFs:
-
Intrinsic mode functions
- EEMD:
-
Ensemble EMD
- CEEMD:
-
Complementary EEMD
- ABP:
-
Arterial blood pressure
- IF:
-
Instantaneous frequency
- HT:
-
Hilbert transform
- NHT:
-
Normalized HT
- iPRV:
-
Instantaneous PRV
- EtCO2 :
-
End-tidal CO2
- HUT:
-
Head-up tilt
- FM:
-
Frequency modulation
- iPR:
-
Instantaneous PR
- LH ratio:
-
Low–high ratio
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Acknowledgments
Research supported by Taiwan National Science Council under Grant Number: NSC 100-2314-B-040-003, NSC-102-2220-E-009-001, NSC-102-2220-E-009-023 and NSC-102-2627-E-010-001 and in part by “Aim for the Top University Plan” of the National Chiao Tung University and Ministry of Education, Taiwan, R.O.C. This work was also supported in part by the UST-UCSD International Center of Excellence in Advanced Bioengineering sponsored by the Taiwan National Science Council I-RiCE Program under Grant Number: NSC-101-2911-I-009-101.
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Chang, CC., Hsiao, TC. & Hsu, HY. Frequency range extension of spectral analysis of pulse rate variability based on Hilbert–Huang transform. Med Biol Eng Comput 52, 343–351 (2014). https://doi.org/10.1007/s11517-013-1135-5
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DOI: https://doi.org/10.1007/s11517-013-1135-5
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