Wiens Andrew D, Carek Andrew M, Inan Omer T
Electrical and Computer Engineering, Georgia Institute of Technology, Technology Square Research Building, 85 Fifth Street NW, Atlanta, Georgia 30308, USA
J Acoust Soc Am. 2015 Sep;138(3):EL342-6. doi: 10.1121/1.4929613.
Ballistocardiography (BCG) measures vibrations of the body caused by ejection of blood from the heart, and the root mean square (RMS) of BCG measured with a weighing scale trends with cardiac output. However, BCG underwater has not been studied. Head-to-foot BCG signals were recorded with an accelerometer on the sternum of three human subjects. The heartbeats were clearly visible in the signals recorded underwater, and the resting change in RMS BCG was +360 μg (+36%) from air to cold water immersion (27.8 °C) while standing. This is within the 32%-62% increase in cardiac output observed in previous head-out immersion studies.
心冲击图描记法（BCG）测量由心脏射血引起的身体振动，并且用体重秤测量的BCG的均方根（RMS）与心输出量呈趋势相关。然而，水下BCG尚未得到研究。用加速度计在三名人类受试者的胸骨上记录了从头到脚的BCG信号。在水下记录的信号中，心跳清晰可见，站立时从空气到冷水浸没（27.8°C），RMS BCG的静息变化为+360μg（+36%）。这在先前头部露出水面的浸没研究中观察到的心输出量增加32%-62%的范围内。
