Freezing is also off time. Freezing is the temporary, involuntary inability to move. It is as if one's feet were stuck to the floor. End of dose deterioration, the most common cause of fluctuating motor ability, comes, as the name suggests, at the end of a dose period. On is used to describe the period when the patient's medication is working.
Movements are normal or almost normal.
The patient is in a relative state of good motor function. Such on time may or may not be associated with dyskinesias. Tremor most commonly occurs when the muscle is at rest. Tremors usually disappear during sleep and increase under stress. A person may well be on and still have some tremor.