All Glossary Terms
Training

Motor Unit Recruitment

The activation of motor units to generate force.

Motor unit recruitment is how the nervous system activates motor units to produce force. Recruitment follows the size principle: smaller motor units are recruited first, with larger ones added as force demands increase. Training can improve recruitment - a major factor in early strength gains. Heavy training improves the ability to recruit high-threshold motor units.

Examples

  • Light loads recruit few motor units
  • Heavy loads recruit all available units
  • Improved recruitment from training

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