Motor unit recruitment

General depiction of a motor unit, consisting of a motor neuron innervating a group of muscle fibers.

Motor unit recruitment is the activation of additional motor units to accomplish an increase in contractile strength in a muscle.[1] A motor unit consists of one motor neuron and all of the muscle fibers it stimulates. All muscles consist of a number of motor units and the fibers belonging to a motor unit are dispersed and intermingle amongst fibers of other units. The muscle fibers belonging to one motor unit can be spread throughout part, or most of the entire muscle, depending on the number of fibers and size of the muscle.[2][3] When a motor neuron is activated, all of the muscle fibers innervated by the motor neuron are stimulated and contract. The activation of one motor neuron will result in a weak but distributed muscle contraction. The activation of more motor neurons will result in more muscle fibers being activated, and therefore a stronger muscle contraction. Motor unit recruitment is a measure of how many motor neurons are activated in a particular muscle, and therefore is a measure of how many muscle fibers of that muscle are activated. The higher the recruitment the stronger the muscle contraction will be. Motor units are generally recruited in order of smallest to largest (smallest motor neurons to largest motor neurons, and thus slow to fast twitch) as contraction increases. This is known as Henneman's size principle.[4]

  1. ^ Betts, J Gordon; Desaix, Peter; Johnson, Eddie; Johnson, Jody E; Korol, Oksana; Kruse, Dean; Poe, Brandon; Wise, James; Womble, Mark D; Young, Kelly A (June 7, 2023). Anatomy & Physiology. Houston: OpenStax CNX. 10.3 Muscle Fiber Contraction and Relaxation. ISBN 978-1-947172-04-3.
  2. ^ Ounjian, M., R.R. Roy, E. Eldred, A Garfinkel, J.R. Payne, A. Armstrong, A. Toga, and V.R. Edgerton Physiological and Developmental Implications of Motor Unit Anatomy. J. Neurobiol. 22:547-559, 1991. Motor unit territory.
  3. ^ Bodine-Fowler, S., Garfinkel, A., Roy, Roland R., and Edgerton, V. Reggie. Spatial distribution of muscle fibers within the territory of a motor unit. Muscle and Nerve 13:1133-1145, 1990. - non-random distribution of fibers.
  4. ^ Henneman, E., Somjen, G. & Carpenter, D. O. (1965). Functional significance of cell size in spinal motoneurons. J. Neurophysiol. 28, 560-580.