Suppression of respiratory rhythm instability during running by respiratory cycle command

(Suppression of LRC instability during running by respiratory cycle command)

Abstract

It is known that a phenomenon in which a respiratory rhythm coupling with a locomotor rhythm (LRC: locomotor-respiratory rhythm coupling) occurs during running. At this LRC, the respiratory rhythm rate increases in proportion to the locomotor rhythm intensity, and when it approaches the limit locomotor rhythm intensity, an unstable phenomenon of the respiratory rhythm becomes sometimes observed. This instability of the respiratory rhythm causes lower exercise efficiency, so it is necessary to keep the stable respiratory rhythm up to the faster locomotor rhythm as far as possible. Therefore, we obtain a LRC model with a locomotor rhythm added to the nonlinear differential equation that expresses the respiratory rhythm. We consider a method of a respiratory cycle command from a cerebral cortex to suppress the instability of the LRC for this model. By simulation, we show LRC, the instability of the LRC, and the respiratory cycle command from the cerebral cortex to suppress this instability.