Muscle or groups of muscles can be rated according to their strength, as to how much they do actually are
- able to contract, or
- show at least signs of contraction, and
- able to produce movement
Customarily the general muscle strength is graded into 5 categories.
|No evidence of contractility, usually nerve damage or paralysis.
Nothing happening here.
|Evidence of slight contractility, no joint motion.
The muscle is functioning albeit very, very weak.
|Complete range of motion with gravity eliminated.|
|Complete range of motion against gravity.
Can flail their own body parts around with no extra load added.
|Complete range of motion against gravity with some resistance.|
|Complete range of motion against gravity with full resistance.
Even when additional load is put on the movement can be performed.