Abstract
Background: Spectral analysis of heart rate (HR) variability (HRV) requires, as a rule, some level of stationarity and, as a result, is inadequate to quantify biological transients. A time-/frequency-domain method (TF) was developed to obtain an instant spectral power (SP) of HRV during tilt. Methods and Results: HR was recorded by Holter monitoring in volunteers and analyzed with a TF, the smoothed pseudo-Wigner-Ville transformation (SPWVT), with the table inclination randomly set or continuously increased while the table rotated in head-up position. (1) The SPWVT assesses, beat by beat, the instant center frequency (ICF) of the SP. ICF correlates better with instant HR than the ratio of low- (LF) to high-frequency (HF) oscillations. The transient effect of tilt is better characterized as a shift of SP toward lower frequencies than by changes in amplitudes. (2) The method evidences variations of HR from one second to another. During the passage to head-up position, the vagal withdrawal and the sympathetic activation occur nearly simultaneously, as indicated by the instant changes in both LF and HF amplitudes and ICF. (3) The averaged results of the SPWVT give results similar to those previously obtained with autoregressive algorithms. Conclusions: The SPWVT is a new tool to explore HR transitions such as periods before episodes of arrhythmias on a time scale of one beat and allows quantification of an instant frequency index (ICF) that closely reflects the instantaneous relationship between sympathetic and vagal modulations.
| Original language | English |
|---|---|
| Pages (from-to) | 3521-3526 |
| Number of pages | 6 |
| Journal | Circulation |
| Volume | 96 |
| Issue number | 10 |
| Publication status | Published - Nov 18 1997 |
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Keywords
- Electrocardiology
- Fourier analysis
- Heart rate
- Intervals
- Physiology
ASJC Scopus subject areas
- Physiology
- Cardiology and Cardiovascular Medicine
Cite this
Instant power spectrum analysis of heart rate variability during orthostatic tilt using a time-/frequency-domain method. / Jasson, Sylvain; Médigue, Claire; Maison-Blanche, Pierre; Montano, Nicola; Meyer, Laurent; Vermeiren, Christophe; Mansier, Pascale; Coumel, Philippe; Malliani, Alberto; Swynghedauw, Bernard.
In: Circulation, Vol. 96, No. 10, 18.11.1997, p. 3521-3526.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Instant power spectrum analysis of heart rate variability during orthostatic tilt using a time-/frequency-domain method
AU - Jasson, Sylvain
AU - Médigue, Claire
AU - Maison-Blanche, Pierre
AU - Montano, Nicola
AU - Meyer, Laurent
AU - Vermeiren, Christophe
AU - Mansier, Pascale
AU - Coumel, Philippe
AU - Malliani, Alberto
AU - Swynghedauw, Bernard
PY - 1997/11/18
Y1 - 1997/11/18
N2 - Background: Spectral analysis of heart rate (HR) variability (HRV) requires, as a rule, some level of stationarity and, as a result, is inadequate to quantify biological transients. A time-/frequency-domain method (TF) was developed to obtain an instant spectral power (SP) of HRV during tilt. Methods and Results: HR was recorded by Holter monitoring in volunteers and analyzed with a TF, the smoothed pseudo-Wigner-Ville transformation (SPWVT), with the table inclination randomly set or continuously increased while the table rotated in head-up position. (1) The SPWVT assesses, beat by beat, the instant center frequency (ICF) of the SP. ICF correlates better with instant HR than the ratio of low- (LF) to high-frequency (HF) oscillations. The transient effect of tilt is better characterized as a shift of SP toward lower frequencies than by changes in amplitudes. (2) The method evidences variations of HR from one second to another. During the passage to head-up position, the vagal withdrawal and the sympathetic activation occur nearly simultaneously, as indicated by the instant changes in both LF and HF amplitudes and ICF. (3) The averaged results of the SPWVT give results similar to those previously obtained with autoregressive algorithms. Conclusions: The SPWVT is a new tool to explore HR transitions such as periods before episodes of arrhythmias on a time scale of one beat and allows quantification of an instant frequency index (ICF) that closely reflects the instantaneous relationship between sympathetic and vagal modulations.
AB - Background: Spectral analysis of heart rate (HR) variability (HRV) requires, as a rule, some level of stationarity and, as a result, is inadequate to quantify biological transients. A time-/frequency-domain method (TF) was developed to obtain an instant spectral power (SP) of HRV during tilt. Methods and Results: HR was recorded by Holter monitoring in volunteers and analyzed with a TF, the smoothed pseudo-Wigner-Ville transformation (SPWVT), with the table inclination randomly set or continuously increased while the table rotated in head-up position. (1) The SPWVT assesses, beat by beat, the instant center frequency (ICF) of the SP. ICF correlates better with instant HR than the ratio of low- (LF) to high-frequency (HF) oscillations. The transient effect of tilt is better characterized as a shift of SP toward lower frequencies than by changes in amplitudes. (2) The method evidences variations of HR from one second to another. During the passage to head-up position, the vagal withdrawal and the sympathetic activation occur nearly simultaneously, as indicated by the instant changes in both LF and HF amplitudes and ICF. (3) The averaged results of the SPWVT give results similar to those previously obtained with autoregressive algorithms. Conclusions: The SPWVT is a new tool to explore HR transitions such as periods before episodes of arrhythmias on a time scale of one beat and allows quantification of an instant frequency index (ICF) that closely reflects the instantaneous relationship between sympathetic and vagal modulations.
KW - Electrocardiology
KW - Fourier analysis
KW - Heart rate
KW - Intervals
KW - Physiology
UR - http://www.scopus.com/inward/record.url?scp=0343765701&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0343765701&partnerID=8YFLogxK
M3 - Article
C2 - 9396450
AN - SCOPUS:0343765701
VL - 96
SP - 3521
EP - 3526
JO - Circulation
JF - Circulation
SN - 0009-7322
IS - 10
ER -