人体心肺系统相位同步转变的实验证据
Experimental evidence for phase synchronization transitions in human cardio-respiratory system
摘要：
复杂系统动力学的转变可以通过其组件的同步行为的变化来表征。以人的心肺系统为例，并使用自动化程序筛选同步图的112名健康受试者，我们研究的频率和分布的同步事件在不同的生理条件下，发生在睡眠期间。我们发现心跳和呼吸之间的相位同步在非快速眼动（非REM）睡眠（深睡眠和浅睡眠）期间显著增强，而在REM睡眠期间减少。我们的研究结果表明，同步主要是由于呼吸振荡器对心跳振荡器的微弱影响，这是在长期相关噪声的存在下受到干扰，叠加在REM睡眠期间更高的大脑区域的活动。
英文摘要：
Transitions in the dynamics of complex systems can be characterized by changes in the synchronization behavior of their components. Taking the human cardio-respiratory system as an example and using an automated procedure for screening the synchrograms of 112 healthy subjects we study the frequency and the distribution of synchronization episodes under different physiological conditions that occur during sleep. We find that phase synchronization between heartbeat and breathing is significantly enhanced during non-rapid-eye-movement (non-REM) sleep (deep sleep and light sleep) and reduced during REM sleep. Our results suggest that the synchronization is mainly due to a weak influence of the breathing oscillator upon the heartbeat oscillator, which is disturbed in the presence of long-term correlated noise, superimposed by the activity of higher brain regions during REM sleep.
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