Technical Guide to the System's Output

The rhythmogram strip is shown in the upper left corner of the screen. Two tables under the rhythmogram strip represent the test parameters of the supine (left) and orthostatic (right) positions. 

1. The tables include the following data:
HR [beats per minute] - Heart Rate

HF [msec ] - the Power of Spectral Function of High Frequency range 0.4-0.15 [Hz] (This is the index of the Parasympathetic Tone).

LF1 [msec ] - the Power of Spectral Function of Low Frequency range 0.07-0.15 [Hz].  LF1 is an index of Sympathetic and Parasympathetic Tone activities, corresponding to the baroreflex influences on the Heart Rate Variability (waves of Traube-Gearing).

LF2 [msec ] - the Power of Spectral Function of Low Frequency range 0.04-0.07 [Hz]. LF2 is the index of Sympathetic Tone (waves of Mayer).

TP [msec ] - This is the Total Power of Spectral Function of all the frequencies 0.04-0.4 [Hz]. This is a combined index of the ANS activity.

2. If you do not see the statement: "Extrasystoles not recognized" under the described chart that means that there were extrasystoles detected. In this case appropriate diagnostic referral or testing should be considered.

NOTE: This feature is necessary for proper Spectral Analysis of the data. However, we make no representation or claims as to any diagnostic capabilities of the Nerve-Express System.

3. The left lower part of the printout is dedicated to the conclusion about the Tone of the ANS (supine) and the reactivity of the ANS (upright). All the conclusions represent a qualitative description of the ANS state that is represented graphically by a point in a system of two coordinates (PSNS and SNS).

Each point is composed of two corresponding components. For example, the point in Fig. 6 has a value of 3 on PSNS (the x-axis) representing a significant Parasympathetic increase, and a value of 2 on SNS (the y-axis) representing a moderate Sympathetic increase.

Sharply Increased

Significantly Increased

Moderately Increased

Slightly Increased

Slightly decreased

Moderately decreased

Significantly decreased

Sharply decreased


Fig. 6 ANS Status represented by a point of two coordinates, PSNS and SNS

The conclusion then reads as follows:


This is the main principle for formulating the conclusions for all the 60 recognizable points. Below is a description of these points subdivided into 8 groups of ANS categories. The numerical values are in brackets.

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System Specifications


  • DOS based laptop computer

  • Chest electrodes with transmitter

  • Clip receiver with cable (2.5 ft.) and plug for serial port.

  • Laser Printer required (not included)

Note: Receiver may be clipped to the subjects clothes.  The distance from the transmitter to the receiver may not exceed 2-2.5 ft.

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