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Heart rate variability recording and analysis

 
March 31, 2004

A technology of this kind was used in the training of astronauts. Heart rate monitoring remains one of the most important indicators in the fields of biology and medicine, with prognostic information about the functional state and adaptive capacity of the entire organism able to be obtained through just one reading. Heart rate variability is a measure of the variation in the beat-to-beat interval, also known as RR variability, where R is the peak of the graphical deflection caused by a heartbeat as displayed on an electrocardiogram. There are many applications of HRV data, with an enormous number of heart defects and emotional responses alike reflected in the variations of the beat-to-beat interval.

 

Measuring HRV is a non-invasive and relatively simple task once margins of error and other irregularities are accounted for, with electrocardiography, blood pressure and ballistocardiograms all used as measurement tools. Various time-, frequency- and geometric-based models have been developed in the field of HRV analysis. Temporal analysis is the simplest method, and can involve measuring the standard deviation of beat-to-beat intervals, usually over a five minute period but sometimes over 24 hours; the number of pairs of successive intervals which differ by more than a certain length of time, usually 20ms or 50ms, in a given period; or the range of beat length over a predetermined measurement period. HRV can also be assessed based on geometrical or graphical analysis of a data sample. Graphical analysis can provide an in-depth view of various aberrations in heart rates, such as excessively short or long intervals observed, asymmetrical heartbeats. Spectral methods of analysis can show frequency bands and calculate the number of heartbeats which fall within the specified bands, speeding up analysis. The Fourier transform provides analysis of waves of interval length. Long-term and even non-linear testing methods also exist.

 

Software with four versions for different fields

 

Software with four versions for different fields

  
Client: Biotechnology startup
Description: Development of a software suite for scientific research in the field of biology and human physiology. This application suite was developed as the result of scientific research in human physiology and sports medicine. The method was patented and software was internationalized. This work underlies the online version of the system. A wireless cardio-monitor device was designed to record heart rates in real time. The 'scientific' version is intended for scientific research on heart rate variability. Further to this, an expert system was designed for the rapid diagnosis with regard to whole body conditioning. It works by analysing the interaction of a human body's regulatory systems governing the processes within the cardiovascular system. This expert system can determine over a thousand different bodily states which are divided into three main categories: satisfactory, strained, and unsatisfactory. This work included the development of an online shop.
Technologies: Ajax, Delphi, Expert system, FFT, Functional Analysis, GUI, Mathematics, PHP, RS-232, Signal Processing, WinAPI, Windows

 

Development of wireless heart rate monitor

 

Development of wireless heart rate monitor

  
Client: Biotechnology startup
Description:

We designed and implemented a heart rate monitor for a PC. This device is able to register the human heartbeat then transmit this information to a PC using radio communication. The work included:

  • Circuit design
  • Implementation of microcode for Microchip MC with assembler
  • Case design
  • Creation of technical documentation for small-batch production
Technologies: Assembler, AutoCAD, C, Delphi, Microchip, MPLAB, USB, Windows