Bryant T N, Fernandes A, Baty D
J Biomed Eng. 1986 Apr;8(2):171-4. doi: 10.1016/0141-5425(86)90054-3.
Low back pain is a common ailment encountered in clinical practice, yet there has hitherto been no completely satisfactory method for the measurement of truncal stress, which is a major factor in low back pain. Truncal stress has been difficult to record during the course of a working day because subjects were constrained by trailing cables attached to the monitoring equipment. We have used a pressure sensitive transmitter (radio pill) to record intra-abdominal pressure, which has been shown previously to be an indirect measure of truncal stress. The system makes possible multichannel recordings on magnetic tape throughout the working day by using a portable, battery powered recorder strapped to the subject's waist. A novel ferrite rod contributes materially to minimizing artefacts due to signal loss. The recorded data are replayed, at 60 times real time, into a microcomputer programmed to analyse this data.
下背痛是临床实践中常见的病症，但迄今为止，尚无完全令人满意的方法来测量躯干应力，而躯干应力是下背痛的一个主要因素。在工作日期间，躯干应力一直难以记录，因为受试者受到连接到监测设备的拖曳电缆的限制。我们使用了一种压敏发射器（无线电药丸）来记录腹内压，此前已证明腹内压是躯干应力的间接测量指标。该系统通过使用绑在受试者腰部的便携式电池供电记录仪，能够在整个工作日对磁带进行多通道记录。一种新型铁氧体棒在最大限度减少信号损失引起的伪影方面发挥了重要作用。记录的数据以60倍实时速度重放至一台编程用于分析此数据的微型计算机中。
