运动条件下心率变异的非线性动力学分析

为探讨运动状态时心率变异性的特征，应用非线性动力学的方法分析了安静和运动条件下心率变异的变化，受试者为９名健康男性，实验前安静平卧１０ｍｉｎ后在运动负荷功率５０Ｗ，１００Ｗ各运动１０ｍｉｎ，结果显示，在运动过程中，受试者Ｒ－Ｒ间期平均值，标准差明显减低，同时表征心率变异复杂性的非线性动力学指标（复杂度，熵，关联维，容量维）也明显降低，运动负荷１００Ｗ时受试者的非线性动力学分析指标的下降程度大于其在

Nonlinear Dynamic Analysis of Heart Rate Variability during Exercise.

Nonlinear dynamic analysis was used to examine the changes of complexity of heart rate variability (HRV) under rest and exercise. Nine healthy male subjects participated in the test. Each subject had a rest in supine position for 10 min,and then exercised on a cycle ergometer (10 min at 50 W and 10 min at 100 W). The results showed that R-R interval and its standard deviation reduced,and at the same time the values of nonlinear dynamics indices (complexity, entropy, correlation dimension, capacity dimension ) also decreased during exercise.Moreover, at 100W work load the decrease of these indices was greater than that of 50W. It shows that physical exercise may reduce the complexity of HRV, and nonlinear dynamic indices could be used in distinguishing the complexity of heart rate variability under different physiological conditions.