|Article title||SOME RESULTS OF EXPERIMENTAL RESEARCH PULSE WAVE RADIATION BY THE HUMAN BODY|
|Section||SECTION III. ACOUSTIC METHODS AND DEVICES IN MEDICOBIOLOGICAL PRACTICE|
|Month, Year||10, 2014 @en|
|Abstract||Work is devoted to research of a possibility remote detection of human heart rate in order to detection the presence of a person into the water near the mounting location of sound recording equipment and estimation his condition by means of heart rate variability analysis. The results of experimental research the human body acoustic waves radiation into the water which are caused by acoustic emission of pulse waves, i.e. propagating through aorta and arteries by waves of the pressure pulsations exerting by ejection of blood from the left ventricle during systole are described. The results of laboratory experiment during which the acoustic signals are registered in a water container originated from human limbs at a distance of 0.5 m by pulse waves are presented. The signals are selected with the help of a low-frequency hydrophone, energy detector with the band-pass range 0,2–100 Hz and software-based energy receiver, including a band-pass filter 10–20 Hz, quadratic detector and integrator with the 0,3 s integration time, which frequency coincides with the heart rate frequency. The received signals are suitable for estimation of heart rate variability. It can be used for noncontact sensing a condition of people"s cardiovascular system who take contrast baths or detection of people in water near the protected objects. The demands to a pass-band filter and integration time are considered. It is specified that the used approach did not yield positive results for some of the examined persons.|
|Keywords||Pulse wave; pulse rate; low-frequency hydrophone; energy detection.|
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