The Congruent Facelift by Lawrence C. Y. Ho Michael F. Klaassen & Kumar Mithraratne

Author:Lawrence C. Y. Ho, Michael F. Klaassen & Kumar Mithraratne
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Another variable that needs to be considered for determining the contractile force generated within the muscle is the degree of activation. The force-length and force-velocity functional parameters discussed above did not consider the degree of activation. Based on the required muscle force for a given task, the central nervous system determines how many fibres of the muscle need to be stimulated. This process is called motor unit recruitment . A motor unit has one motor neuron that sends signals to several fibre strands that it innervates. A muscle contains several such motor units. The activation of one motor neuron results in a weak but distributed muscle contractile force. The activation of more motor neurons results in more muscle fibres being activated and therefore a stronger muscle contraction. The higher the recruitment, the stronger the muscle contractile force will be.

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