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Assessing blood pressure unobtrusively by smart chair

机译：通过智能椅子轻松评估血压

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We developed a smart chair with unobtrusive sensors that measure functional-health parameters of a person sitting on the chair. Capacitive sensors are placed in the chair's backrest and seat, while the armrests support a combination of U-shaped electrodes and incorporated photoplethysmographic (PPG) sensors for synchronous electrocardiographic (ECG) and PPG measurements. In a set of experiments with 11 young males, the two types of signals were acquired. Time distances were estimated between the ECG R-wave peaks and the PPG foots as detected by our heartbeat search, yielding the so called pulse transit times (PTTs). The experiments were conducted in two phases: the first one at rest and the second one after a minute of intensive squats. Referential systolic and diastolic blood pressures were taken just before every trial by a Critikon Dinamap Pro 300 sphygmomanometric device. Our goal was to model the relationship between blood pressure and estimated PTTs in both experimental phases. The obtained linear models revealed an interesting observation. Subjects reacted in two different physiological ways; 6 out of 11 participants conformed to a different model as the other 5 did. The main difference is the rate of decrease of either systolic or diastolic pressure per 1-ms change of the PTT.
机译：我们开发了一种带有不引人注目的传感器的智能椅子，该传感器可以测量坐在椅子上的人的功能健康参数。电容式传感器放置在椅子的靠背和座椅上，而扶手则支持U形电极和内置的光电容积描记（PPG）传感器的组合，用于同步心电图（ECG）和PPG测量。在一组针对11位年轻男性的实验中，获得了两种信号。我们的心跳搜索检测到了心电图R波峰和PPG脚之间的时间距离，得出了所谓的脉冲传输时间（PTT）。实验分两个阶段进行：第一个阶段是静止，第二个阶段是经过一分钟的深蹲。在每次试验之前，均使用Critikon Dinamap Pro 300血压计设备测量收缩压和舒张压的参考值。我们的目标是在两个实验阶段中模拟血压与估算的PTT之间的关系。所获得的线性模型揭示了一个有趣的发现。受试者以两种不同的生理方式发生反应; 11位参与者中有6位符合其他5位参与者的模型。主要区别是每1毫秒PTT改变，收缩压或舒张压降低的速率。

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