Heart Rate Variability Analysis

In the analysis of HRV the Nerve-Express system uses a very effective and easy to interpret visual representation of heart rhythm, called rhythmography. Rhythmography draws the time interval between each consecutive heart beat as a straight, vertical line. The longer the interval between each heartbeat (R - R), the longer the vertical line (Fig. 1)

Fig.1 Method of Rhythmography by Dr. Zhemaitite

When these lines are graphed sequentially they present a curve-specific, wave portrait of heart rhythm (Fig. 2a). Rhythmographic representation allows a great deal of information to be compressed in a simple picture. The wave portrait in Fig. 2a is composed of 448 R-R intervals of the ECG. A spectral analysis of this curve allows Nerve-Express to identify two main spectral components (Fig. 2b):

  • High frequency - 0.4 - 0.1 5Hz
  • Low frequency - 0. 15 - 0.04 Hz

It has been found that there is a high correlation between the power of High-frequency spectrum and the tone of the Parasympathetic Nervous System (PSNS), and also between the power of Low -frequency spectrum and the tone of the Sympathetic Nervous System (SNS). This finding has been well documented in a number of medical and scientific publications and in conference reports from the American College of Cardiology, the American Heart Association, and others.

Nerve-Express uses a unique algorithm, which helps to analyse peak amplitudes in both high and low spectral frequencies and to graph the quantitative relationship between activities of the Sympathetic and the Parasympathetic tones.
 

Fig.2 a) Wave 'portrait' of Heart Rate Variability
        b) Spectral Function of Heart Rate Variability

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