Defining Spasticity

Q14. How is spasticity defined?
1. The classic definition of spasticity is: "A motor disorder characterized by a velocity dependent increase in tonic stretch reflexes (muscle tone) and increased tendon jerks resulting from disinhibition of the stretch reflex, as one component of an upper motor neuron lesion."
2. While a more up to date definition states that spasticity is: "disordered sensori-motor control, resulting from an upper motor neuron lesion, presenting as intermittent or sustained involuntary activation of muscle."