Watanabe Kajiro, Watanabe Takashi, Watanabe Harumi, Ando Hisanori, Ishikawa Takayuki, Kobayashi Keita
System Control Engineering Department, Faculty of Engineering, Hosei University, 3-7-2 Kajinocho Koganei, Tokyo 184-8584, Japan.
IEEE Trans Biomed Eng. 2005 Dec;52(12):2100-7. doi: 10.1109/TBME.2005.857637.
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.
我们开发了一种基于无创气动学的系统，用于测量躺在床上的受试者的心跳、呼吸、打鼾和身体运动。在受试者的床垫下方放置一个薄的气密垫子，使用频率响应在0.1至5 kHz几乎平坦且灵敏度为56 mV/Pa的压力传感器，将归因于人体自动生命功能的微小运动测量为压力变化。使用新开发的系统，可以清晰地测量心跳、呼吸、呼吸暂停、打鼾和身体运动。此外，还给出了用于评估心率测量可靠性的最佳信噪比。在四种不同的身体姿势、13名不同的受试者、四种不同的床垫和三个不同的传感器位置下测量了心率。对于这些测量，信噪比范围为15.9至23.5 dB，因此被确定为可靠。
