back

Muscle Contraction, Part 2

posted by Malachy P. McHugh
filed under fitness postings

Each motor unit has a different activation threshold. Therefore, the magnitude of the motoneuron action potential will determine how many motor units are activated. Additionally, the discharge rate of the motoneuron varies within each motor unit. Therefore, contraction intensity can be controlled by the number of motor units activated and/or the discharge rate of the active units. It's debatable whether humans can voluntarily activate all motor units of a given muscle for a maximal voluntary contraction. The initial strength gains with resistance training are attributed to greater recruitment of available motor units for maximum efforts. This effect occurs before any hypertrophy is evident.

We have updated our Privacy Policy, effective May 25, 2018. We have done this in preparation for the EU's new data privacy law, the General Data Protection Regulation (GDPR). Please take the time to review our updated documentation by clicking on the Privacy Policy link at the bottom of this page. By continuing to use this service on or after May 25, 2018, you agree to our updated Privacy Policy.