A neuro-mechanical model explaining the physiological role of fast and slow muscle fibres at stop and start of stepping of an insect leg

Toth, Tibor Istvan, Grabowska, Martyna, Schmidt, Joachim, Buschges, Ansgar and Daun-Gruhn, Silvia (2013) A neuro-mechanical model explaining the physiological role of fast and slow muscle fibres at stop and start of stepping of an insect leg. PLoS One, 8 11: e78246.1-e78246.14. doi:10.1371/journal.pone.0078246


Author Toth, Tibor Istvan
Grabowska, Martyna
Schmidt, Joachim
Buschges, Ansgar
Daun-Gruhn, Silvia
Title A neuro-mechanical model explaining the physiological role of fast and slow muscle fibres at stop and start of stepping of an insect leg
Journal name PLoS One   Check publisher's open access policy
ISSN 1932-6203
Publication date 2013-11-22
Sub-type Article (original research)
DOI 10.1371/journal.pone.0078246
Open Access Status DOI
Volume 8
Issue 11
Start page e78246.1
End page e78246.14
Total pages 14
Place of publication San Francisco, CA, United States
Publisher Public Library of Science
Abstract Stop and start of stepping are two basic actions of the musculo-skeletal system of a leg. Although they are basic phenomena, they require the coordinated activities of the leg muscles. However, little is known of the details of how these activities are generated by the interactions between the local neuronal networks controlling the fast and slow muscle fibres at the individual leg joints. In the present work, we aim at uncovering some of those details using a suitable neuromechanical model. It is an extension of the model in the accompanying paper and now includes all three antagonistic muscle pairs of the main joints of an insect leg, together with their dedicated neuronal control, as well as common inhibitory motoneurons and the residual stiffness of the slow muscles. This model enabled us to study putative processes of intra-leg coordination during stop and start of stepping. We also made use of the effects of sensory signals encoding the position and velocity of the leg joints. Where experimental observations are available, the corresponding simulation results are in good agreement with them. Our model makes detailed predictions as to the coordination processes of the individual muscle systems both at stop and start of stepping. In particular, it reveals a possible role of the slow muscle fibres at stop in accelerating the convergence of the leg to its steady-state position. These findings lend our model physiological relevance and can therefore be used to elucidate details of the stop and start of stepping in insects, and perhaps in other animals, too.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Brain Institute Publications
 
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Created: Mon, 13 Mar 2017, 13:55:06 EST by Martyna Grabowska on behalf of Learning and Research Services (UQ Library)