Gu H G, Ren W, Lu Q S, Liu G, Shen X Y, Meng J R
Institute of Space Medico-Engineering, Beijing, China.
Space Med Med Eng (Beijing). 2001 Jun;14(3):192-5.
Objective. To introduce the degree of complexity in characterizing heart rate variability (HRV), and to discuss the changes in complexity of the cardiovascular system during orthostatic standing posture. Method. ECG of 8 subjects were recorded during supine and orthostatic standing postures. Degree of complexity was used to analyze the HRV. Result. Compared to supine before orthostatic standing posture, R-R intervals and its standard deviation at 0-5 min, 5-10 min, 10-15 min and 15-20 min during orthostatic standing posture were decreased significantly; the degree of complexity of HRV at 0-5 min and 15-20 min during orthostatic 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 orthostatic standing. It was feasible that the degree of complexity can be used to analyze HRV.
目的。介绍心率变异性（HRV）特征描述中的复杂程度，并讨论直立姿势期间心血管系统复杂性的变化。方法。记录8名受试者仰卧位和直立姿势时的心电图。使用复杂程度分析HRV。结果。与直立姿势前的仰卧位相比，直立姿势期间0 - 5分钟、5 - 10分钟、10 - 15分钟和15 - 20分钟时的R - R间期及其标准差显著降低；直立姿势期间0 - 5分钟和15 - 20分钟时HRV的复杂程度显著降低；0 - 5分钟和15 - 20分钟时的近似熵显著降低。结论。结果表明，直立姿势期间HRV和心血管系统的复杂性降低。使用复杂程度分析HRV是可行的。
