Dynamics of the locomotor-respiratory coupling at different frequencies

Experimental Brain Research
Charles P Hoffmann, Benoît G Bardy

Abstract

The locomotor-respiratory coupling (LRC) is a universal phenomenon reported for various forms of rhythmic exercise. In this study, we investigated the effect of movement and respiratory frequencies on LRC. Participants were instructed to cycle or breath in synchrony with a periodic auditory stimulation at preferred and non-preferred frequencies. LRC stability was assessed by frequency and phase coupling indexes using the theory of nonlinear coupled oscillators through the sine circle map model, and the Farey tree. Results showed a stabilizing effect of sound on LRC for all frequencies and for the two systems paced. The sound-induced effect was more prominent when the rhythm of the stimulation corresponded to the preferred frequencies. The adoption of cycling or respiratory frequencies far off preferential ones led to a loss of stability in LRC. Contrary to previous findings, our results suggest that LRC is not unidirectional-from locomotion onto respiration-but bidirectional between the two systems. They also suggest that auditory information plays an important role in the modulation of LRC.

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Citations

Jul 15, 2020·Journal of Cognitive Neuroscience·Cécile J BouvetManuel Varlet
Dec 18, 2019·Neuroscience and Biobehavioral Reviews·Loïc DammBenoît Bardy
Aug 24, 2021·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Dobromir Dotov, Laurel J Trainor

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