Circulation, Vol 90, 1826-1831, Copyright © 1994 by American Heart Association
N Montano, TG Ruscone, A Porta, F Lombardi, M Pagani and A Malliani
BACKGROUND: The powers of the low-frequency (LF) and high-frequency (HF)
oscillations characterizing heart rate variability (HRV) appear to reflect,
in their reciprocal relationship, changes in the state of the sympathovagal
balance occurring during numerous physiological and pathophysiological
conditions. However, no adequate information is available on the
quantitative resolution of this methodology. METHODS AND RESULTS: We
studied 22 healthy volunteers (median age, 46.5 years) who were subjected
after a rest period to a series of passive head-up tilt steps randomly
chosen from the following angles: 15 degrees, 30 degrees, 45 degrees, 60
degrees, and 90 degrees. From the continuous ECG, after appropriate
analog-to-digital conversion, a personal computer was used to compute, with
an autoregressive methodology, time and frequency domain indexes of RR
interval variability. Spectral and cross-spectral analysis with the
simultaneously recorded respiratory signal excluded its contribution to LF.
Age was significantly correlated to variance and to the absolute values in
milliseconds squared of very-low-frequency (VLF), LF, and HF components.
The tilt angle was correlated to both LF and HF (expressed in normalized
units [nu]) and to the LF-to-HF ratio (r = .78, -.72, and .68;
respectively). Lower levels of correlation were found with HF (in ms2) and
RR interval. No correlation was present between tilt angle and variance,
VLF, or LF (in ms2). Individual analysis confirmed that the use of nu
provided the greatest consistency of results. CONCLUSIONS: Spectral
analysis of HRV, using nu or LF-to-HF ratio, appears to be capable of
providing a noninvasive quantitative evaluation of graded changes in the
state of the sympathovagal balance.
ARTICLES
Power spectrum analysis of heart rate variability to assess the changes in sympathovagal balance during graded orthostatic tilt
Centro Ricerche Cardiovascolari, CNR, Ospedale L. Sacco, Universita degli Studi di Milano, Milano, Italy.
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P. van de Borne, A. L. Mark, N. Montano, D. Mion, and V. K. Somers Effects of Alcohol on Sympathetic Activity, Hemodynamics, and Chemoreflex Sensitivity Hypertension, June 1, 1997; 29(6): 1278 - 1283. [Abstract] [Full Text]
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M. Pagani, N. Montano, A. Porta, A. Malliani, F. M. Abboud, C. Birkett, and V. K. Somers Relationship Between Spectral Components of Cardiovascular Variabilities and Direct Measures of Muscle Sympathetic Nerve Activity in Humans Circulation, March 18, 1997; 95(6): 1441 - 1448. [Abstract] [Full Text]
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P. van de Borne, N. Montano, M. Pagani, R. Oren, and V. K. Somers Absence of Low-Frequency Variability of Sympathetic Nerve Activity in Severe Heart Failure Circulation, March 18, 1997; 95(6): 1449 - 1454. [Abstract] [Full Text]
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J. A. Taylor and D. L. Eckberg Fundamental Relations Between Short-term RR Interval and Arterial Pressure Oscillations in Humans Circulation, April 15, 1996; 93(8): 1527 - 1532. [Abstract] [Full Text]
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T. F. o. t. E. S. o. C. t. N. A. S. o. P. Electrophysiology Heart Rate Variability : Standards of Measurement, Physiological Interpretation, and Clinical Use Circulation, March 1, 1996; 93(5): 1043 - 1065. [Full Text]
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