A noninvasive pneumatics-based system reliably measured heart rates across various conditions, yielding signal-to-noise ratios ranging from 15.9 to 23.5 dB.
Can a noninvasive pneumatics-based system reliably measure heartbeat, respiration, and body movements in subjects in bed?
A newly developed noninvasive pneumatic cushion system can reliably measure heart rate and respiration in bed without attaching sensors to the body.
We have developed a noninvasive pneumatics-based system by which to measure heartbeat, respiration, snoring, and body movements of a subject in bed. A thin, air-sealed cushion is placed under the bed mattress of the subject and the small movements attributable to human automatic vital functions are measured as changes in pressure using a pressure sensor having an almost flat frequency response from 0.1 to 5 kHz and a sensitivity of 56 mV/Pa. Using the newly developed system, heartbeat, respiration, apnea, snoring and body movements are clearly measured. In addition, the optimal signal-to-noise (S/N) ratio by which to evaluate the reliability of the heart rate measurement is presented. Heart rates were measured for four different body postures, 13 different subjects, four different bed mattresses, and three different sensor positions. For these measurements, the S/N ratios ranged from 15.9 to 23.5 dB, and so were determined to be reliable.
Watanabe et al. (Tue,) reported a other. Noninvasive pneumatics-based system was evaluated on Signal-to-noise (S/N) ratio for heart rate measurement. A noninvasive pneumatics-based system reliably measured heart rates across various conditions, yielding signal-to-noise ratios ranging from 15.9 to 23.5 dB.
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