Question

How does the nervous system affect force production?

How does the nervous system affect force production?

Homework Answers

Answer #1

The central nervous system has two distinct ways of controlling the force produced by a muscle through motor unit recruitment. They are

  • spatial recruitment
  • temporal recruitment
  • Spatial recruitment is the activation of more motor units to produce a greater force. Larger motor units contract along with small motor units until all muscle fibers in a single muscle are activated, thus producing the maximum force.
  • Temporal motor unit recruitment or rate coding, deals with the frequency of activation of muscle contractions. Consecutive stimulation on the motor unit fibers from the alpha motor neuron, causes the muscle to twitch more frequently until the twitches "fuse" temporally. This produces a greater force than singular contractions by decreasing the interval between stimulations to produce a larger force with the same number of motor units.
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