心音信号遥测系统监测、评价心率与心力恢复趋势

Monitoring and Evaluation of Heart Rate and Cardiac Contractility Recovery Trend by Heart Sound Phonocardiogram Device

目的:为了更全面的研究和评估心肌的变时、变力和变传导性。方法:随机抽取男性体育系学生(实验组,n=40)和普通大学生(对照组,n=30)完成规定运动量的台阶运动;记录运动后即刻5 min连续变化的心音振动信号。对采集的数据经过三次样条插值、均匀采样和小波变换滤波后得到平滑的心率和心力恢复趋势曲线,在此基础上提取出反映心率和心力恢复趋势的相关指标。结果:安静状态时与运动后实验组与对照组的恢复期的最大心率、心率恢复时间、心率恢复速率无显著性差异(p>0.05),而运动后实验组与对照组之间心力恢复时间、心力恢复速率和心肌收缩能力储备指数都有显著的差异(p<0.001)。结论:大负荷运动量下动用的心力储备主要来自于心肌收缩力的储备而不是心率储备,而且运动员比普通人还具有更快的心肌收缩恢复能力,即具有更快的心力恢复速度。

Objective： To study and evaluate myocardial inotropism and chronotropism more comprehensively. Methods： a heart sound telemetry system with simultaneously sampling signals of cardiac contractility and heart rate of sportsmen are developed. Eve-minute continuous heart sound signals are sampled randomly from 40 men students in physical education department （ experiment group） and 30 men students in general departments （ control group） after ccnapleting designed workload during step-climbing exercise. Smooth cardiac contractility recovery trend curves and heart rate recovery trend curves are obtained by processing the data through cubic spline interpolation, evenly sampling and wavelet transform filtering. Results： Statistic analysis shows that the cardiac reserve under the heavy exercise workload mainly depends on the cardiac contractility reserve rather than the heart rate reserve （p〈0.001）. Compared with the general departments＇ students, the high level cardiac contractility reserve of the physical department＇s students may be reflected not only in cardiac contractility reserve, but also in faster cardiac contractility recovery rate （p〉0.05）. Conclusions： Simultaneous measuring of both cardiac contractility recovery trend and heart rate recovery trend after exercise might be beneficial to comprehensive evaluaden of cardiac function.