Increased muscular tone in Parkinson's disease, either the lead-pipe type of rigidity or the cogwheel-type, occurring in patients showing both static tremor and increased tone.

When doctors move a person's limb passively around a joint, they note the degree of resistance to movement (muscle tone).

Muscle tone which is uneven and suddenly increased (spasticity) may be a result of a stroke or spinal cord injury.

Muscle tone that is evenly increased (rigidity) may be caused by disease of the basal ganglia; such as, Parkinson's disease.

Muscle tone is severely reduced (flaccid) immediately and temporarily after a spinal cord injury produces paralysis.