Online acquisition and wireless transmission of carotid pulse waveforms to analyse posture related changes

The physiological parameters of the fighter plane pilot undergo drastic changes leading to G stress accumulation. Heart rate is considered primary mechanism which plays a great role in acceleration protection research especially for G-LOC (G-induced loss of consciousness). Various methods based on various principles have been developed to study heart rate so far. Carotid pulse waveforms obtained from the human subject with the help of piezoelectric transducer may be used to analyse the cardiac activity. Change in heart rate due to change in the posture may be used to explain G stress effect on humans. Carotid signal is acquired by placing piezoelectric sensor based system on the subject’s carotid artery. The piezoelectric sensor has a transducing element which is efficient and effective to sense movement due to carotid pulse and produce piezoelectric signal data in response thereto. The real time data of carotid pulse waveforms of 12 human subjects are acquired and filtered using MATLAB software in various body postures. RR period and pulse amplitudes are quantified from real time recorded carotid signal by visual inspection. Further Statistical analysis is done to calculate the heart rate. The filtered stored data is transmitted wirelessly from one PC to another PC using Teamviewer software.

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