PDF File - Asclepius Herbal Consultancy
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Appendix IX<br />
To the Heart of the Matter<br />
Heart Rate Variability & Blood Pressure Variability<br />
Appendix Heart rate variability X<br />
Heart rate variability describes low frequency modulation of the heart rate. These modulatory<br />
changes reflect the dynamic response of the cardiovascular system to accommodate for<br />
situations that challenge the cardiovascular physiology. For example:<br />
Sinus arrhythmia in response to thoracic hydrostatic pressure changes.<br />
Changes in heart rate in response to the dynamic changes in circulatory physiology resulting<br />
from changes in body position etc.<br />
The heart rate variability spectrum is measured by the standard deviation of successive R-R<br />
interval, R being the first positive deflection in the QRS complex. Variability is measured using<br />
Fourier or autoregressive analysis, which divides the variability spectrum into high and low<br />
frequency components.<br />
Analysis of the spectrum reveals a high frequency (>0,20 Hz) and a low frequency (
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