About Spasticity
Spasticity is defined as an involuntary, velocity-dependent,
increased resistance to stretch. This definition means that the amount
of resistance to stretching is at least partly determined by the
speed with which a spastic muscle is stretched. One factor that is
thought to be related to spasticity is the stretch reflex.
This reflex is important in coordinating normal movements in which
muscles are contracted and relaxed and in keeping the muscle from
stretching too far.
Although the end result of spasticity is problems with the muscles,
spasticity is actually caused by an injury to a part of the central
nervous system (the brain or spinal cord) that controls voluntary
movements. The damage causes a change in the balance of signals between
the nervous system and the muscles. This imbalance leads to increased
activity (excitability) in the muscles.
To learn more about spasticity, please use the links on the left
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