【摘要】 目的介绍非线性指标复杂度 ;并将之应用于心率变异分析 ,分析立位测试过程中心血管系统复杂性的变化。方法对 8名被试者进行立位耐力测试 ,记录心电信号并用复杂度进行心率变异分析。结果与立位前平卧位相比 ,立位 0～ 5min、5～ 1 0min、1 0～ 1 5min和 1 5～ 2 0min心脏R R间期、R R间期标准差和相临R R间期差值的标准差 (RMSSD)显著降低。立位 0～ 5min、1 5～ 2 0min复杂度和近似熵显著低于平卧位。结论立位期间心率变异降低 ,心血管系统复杂性降低 ;复杂度应用于心率变异的分析是可行的更多还原

【Abstract】 Objective To introduce the degree of complexity in characterizing the heart rate variability (HRV), and to discuss the changes of the complexity of cardiovascular system during orthosatic standing posture. Method ECG of 8 subjects were recorded during supine and orthosatic standing postures. Degree of complexity was used to analyze the HRV. Result Compared to supine before orthosatic standing posture, R R intervals and its standard deviation at 0～5 min, 5～10 min, 10～15 min and 15～20 min during orthosatic standing posture were decreased significantly; the degree of complexity of HRV at 0～5 min and 15～20 min during orthosatic standing posture were decreased significantly; the approximate entropy of 0～5 min and 15～20 min were decreased significantly. Conclusion The results showed that HRV and complexity of cardiovascular system was decreased during orthosatic standing. It was feasible that the degree of complexity can be used to analyze HRV.更多还原