Intermediate
Technical
IVT
co-contraction
Simultaneous activation of agonist and antagonist muscle groups around a joint.
Full Definition
Co-contraction refers to the simultaneous activation of agonist and antagonist muscle groups around a joint, creating increased joint stability but reduced movement efficiency. This protective mechanism is often observed following injury or surgery as the nervous system attempts to provide additional joint stability. While co-contraction can be beneficial for joint protection during early healing phases, persistent co-contraction patterns can lead to decreased functional performance and increased energy expenditure during movement.
Usage
Usage note: Hyphenate as shown; do not use cocontraction as one word.
In Context
- "EMG analysis revealed excessive co-contraction of the quadriceps and hamstrings during gait." — Biomechanical analysis report
Also known as
muscle co-activation
simultaneous muscle activation
Contrasted with
reciprocal inhibition
Don't confuse with
muscle guarding
spasticity