心冲击图心率变异性分析的可行性

 心冲击图（BCG）是一种无接触检测心脏活动的方法。本文研究利用心冲击图进行的心率变异性（HRV）检测。同步采集了20 名测试者在平静、瓦氏动作、瓦氏动作后、运动后4 种生理状态下的心电图（ECG）信号和心冲击图信号；分析了HRV_BCG和HRV_CG在时域、频域、非线性域的测定值；计算了相应测定值的相关性，并利用成对t 检验分析了两种方法的测定值的差异显著性。研究结果表明，在平静、瓦氏动作后和运动后的HRV 测定值无显著性差异。在时间较短的瓦氏动作中，两种方法测定的测定值中nPNN50、LF/HF 和SD₁有显著性差异。

Possibility of Heart Rate Variability Analysis Using Ballistocardiogram

Ballistocardiogram (BCG) is a non-contact cardiac activity monitoring method. Our preliminary research of heart rate variability (HRV) was carried out using BCG. BCG signal and electrocardiography (ECG) signal of 20 subjects were measured synchronously in static, valsalva maneuver, post valsalva maneuver and post exercise states. Cardiac periods of these two signals were calculated using RR intervals of ECG and JJ intervals of BCG respectively. HRV parameters in time domain analysis, in frequency domain analysis and nonlinear analysis were calculated. The correlation of HRV_BCG parameters and HRV_ECG parameters were checked; the significant differences between HRV_BCG and HRV_ECG parameters were tested using paired t-test. Results showed that the variance trends of cardiac periods calculated by ECG and BCG were the same; the correlations of HRV_BCG and HRV_ECG parameters were all above 0.81; HRV_BCG parameters showed no significant differences with HRV_ECG during static, post valsalva maneuver and post exercise state while nPNN50, LF/HF and SD₁ showed significant differences during Valsalva maneuver state.