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The synaptic input to the motoneurons cannot be measured in humans due to ethical and technical difficulties. For these reasons realistic computational models of a motoneuron pool and the innervated muscle fibers (a “motor unit pool”) have an important role in the study of the human control of muscles. However such models are complex and their mathematical analysis is difficult. We present a system...
There are many feedback loops potentially active while a subject performs a plantar flexion. One of these loops encompasses the proprioceptive feedback from muscle spindle Ia afferents, motor neurons (MNs), and the muscle. The aim of this study was to investigate the role of the Ia feedback loop on the low-frequency fluctuations of the plantar flexion torque during the performance of a force task...
A biologically-inspired model of the Soleus neuromuscular system was used to study the influences of musculotendon mechanical properties on the proprioceptive feedback and on the short-latency reflex. The model structure comprised: i) stochastic descending drive to a motoneuron pool; ii) a Hill-type muscle model; and iii) a muscle spindle model with its Ia sensory afferents establishing a feedback...
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