一种基于心冲击图的床垫式睡眠姿态检测系统

A Mattress System of Recognizing Sleep Postures Based on BCG Signal

睡姿识别是诊断和治疗体位相关性睡眠呼吸障碍的核心指标,为实现对人体睡眠姿态的无扰检测,设计开发了一种基于心冲击图(Ballistocardiogram,BCG)形态差异的便携式睡姿识别系统。通过集成压电薄膜传感器的床垫采集人体胸廓部位BCG信号,利用三次B样条小波变换和朴素贝叶斯分类方法,实现波形特征的提取和睡姿样本的预测。对11名健康受试者进行模拟睡眠实验,结果表明:心率特征值的估计与参照方法之间差异均值为0.04±1.3beats/min(±1.96SD),分段校正后的四种基本睡姿识别准确度超过97%,平均正确识别率达97.9%。该系统在测量舒适性和准确度上表现优异,对日常睡眠监测具有良好的应用价值。

Sleep posture recognition is the core index of diagnosis and treatment of positional sleep apnea syndrome. In order to detect body postures noninvasively, we developed a portable approach for sleep posture recognition using BCG signals with their morphological difference. A type of piezo-electric polymer film sensor was applied to the mattress to acquire BCG, the discrete wavelet transform with cubic B-spline was used to extract characteristic parameters and a naive Bayes learning phase was adapted to predict body postures. Eleven healthy subjects participated in the sleep simulation experiments. The results indicate that the mean error obtained from heart rates was 0.04±1.3 beats/min (±1.96 SD). The final recognition accuracy of four basic sleep postures exceeded 97%, and the average value was 97.9%. This measuring system is comfortable and accurate, which can be streamlined for daily sleep monitoring application.