Simulations of the alpha motoneuron pool electromyogram reflex at different preactivation levels in man |
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Authors: | Peter J Slot Thomas Sinkjær |
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Institution: | (1) Department of Medical Informatics and Image Analysis, Aalborg University, Fredrik Bajersvej 7D, DK-9220 Aalborg, Denmark, DK |
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Abstract: | The alpha motoneuron pool and the surface electromyogram (EMG) of the human soleus muscle are modelled, respectively, by
an alpha motoneuron pool model generating the firing patterns in the motor units of e muscle and by a muscle model using these
discharge patterns to simulate the surface EMG. In the alpha motoneuron pool model, we use a population of motoneurons in
which cellular properties like cell size and membrane conductance are distributed according to experimentally observed data.
By calculating the contribution from each motor unit, the muscle model predicts the EMG. Wave forms of the motor unit action
potentials in the surface EMG are obtained from experimental data. Using the model, we are able to give a quantitative prediction
of the motoneuron pool activity and the reflex EMG output at different preactivation levels. The simulated data are consistent
with experimentally obtained results in healthy humans. During static isometric muscle preactivations, the simulations show
that the reflex strength is highly dependent on the intrinsic threshold properties of the alpha motoneuron pool.
Received: 27 April 1993/Accepted in revised form: 8 September 1993 |
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