Niizeki K, Kawahara K, Miyamoto Y
Department of Electrical and Information Engineering, Faculty of Engineering, Yamagata University, Yonezawa, Japan.
J Appl Physiol (1985). 1993 Oct;75(4):1815-21. doi: 10.1152/jappl.1993.75.4.1815.
The nature of entrainment between cardiac and locomotor rhythms was investigated while normal human subjects walked or ran on a treadmill. To detect the incidence of entrainment occurrence, the phase relationships among cardiac, respiratory, and locomotor rhythms were analyzed. The phase relationship between heartbeats and gait signals showed that entrainment of cardiac rhythm to locomotor rhythm occurred in all subjects at one or more treadmill speeds. To elucidate interactions among cardiac, respiratory, and locomotor rhythms during the cardiolocomotor synchronization, spectral and coherence analyses were done for these three rhythms. Spectral and coherence analyses on fluctuations in the heart period and respiratory rhythms revealed that the strength of coupling between cardiac and respiratory rhythms decreased in the presence of cardiolocomotor synchronization. In addition, the coupling of cardiac and locomotor rhythms appeared to induce dissociation of coupling between respiratory and locomotor rhythms. These results were similar to those observed when stepping was voluntarily synchronized with cardiac rhythm. Possible mechanisms to explain coordination and interaction among the neural oscillators innervating these three rhythms are discussed.
在正常人类受试者在跑步机上行走或跑步时，研究了心脏节律与运动节律之间的夹带性质。为了检测夹带发生的发生率，分析了心脏、呼吸和运动节律之间的相位关系。心跳与步态信号之间的相位关系表明，在所有受试者中，在一种或多种跑步机速度下，心脏节律会夹带至运动节律。为了阐明心脏运动同步过程中心脏、呼吸和运动节律之间的相互作用，对这三种节律进行了频谱和相干分析。对心动周期和呼吸节律波动的频谱和相干分析表明，在存在心脏运动同步的情况下，心脏节律与呼吸节律之间的耦合强度降低。此外，心脏节律与运动节律的耦合似乎会导致呼吸节律与运动节律之间的耦合解离。这些结果与自愿将步幅与心脏节律同步时观察到的结果相似。讨论了解释支配这三种节律的神经振荡器之间协调和相互作用的可能机制。
