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• W4328049297 abstract "Muscle fibres possess unique visco-elastic properties, which generate a stabilising zero-delay response to unexpected perturbations. This instantaneous response-termed preflex-mitigates neuro-transmission delays, which are hazardous during fast locomotion due to the short stance duration. While the elastic contribution to preflexes has been studied extensively, the function of fibre viscosity due to the force-velocity relation remains unknown. In this study, we present a novel approach to isolate and quantify the preflex force produced by the force-velocity relation in musculo-skeletal computer simulations. We used our approach to analyse the muscle response to ground-level perturbations in simulated vertical hopping. Our analysis focused on the preflex-phase-the first 30 ms after impact-where neuronal delays render a controlled response impossible. We found that muscle force at impact and dissipated energy increase with perturbation height, helping reject the perturbations. However, the muscle fibres reject only 15% of step-down perturbation energy with constant stimulation. An open-loop rising stimulation, observed in locomotion experiments, amplified the regulatory effects of the muscle fibre's force-velocity relation, resulting in 68% perturbation energy rejection. We conclude that open-loop neuronal tuning of muscle activity around impact allows for adequate feed-forward tuning of muscle fibre viscous capacity, facilitating energy adjustment to unexpected ground-level perturbations." @default.
• W4328049297 created "2023-03-22" @default.
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• W4328049297 date "2023-03-20" @default.
• W4328049297 modified "2023-09-25" @default.
• W4328049297 title "Muscle prestimulation tunes velocity preflex in simulated perturbed hopping" @default.
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• W4328049297 doi "https://doi.org/10.1038/s41598-023-31179-6" @default.
• W4328049297 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36941316" @default.
• W4328049297 hasPublicationYear "2023" @default.
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