How does recruitment work and why does our body do this?
What will be an ideal response?
As an increased load is placed on a muscle, as when you pick up a heavy object, more motor units are recruited to provide extra tension in the muscle. Recruitment proceeds according to the nature of the motor units. Smaller, slow-twitch units are recruited first, followed by the intermediate Type IIa units, and finally the largest, fastest Type IIb units. The smaller neurons that innervate slow-twitch fibers are more easily excited by synaptic input, which explains why they are recruited first. Recruiting the smaller motor units first ensures that the body uses the smallest amount of force and energy to get a job done.
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