What is a common characteristic of resting tremors in Parkinson's disease?

Resting tremors in Parkinson's disease are characterized by their tendency to decrease or disappear when the individual engages in purposeful movements. This is a hallmark feature of the tremors associated with this condition. The resting tremor typically occurs when the muscles are relaxed and there is no intentional movement; however, when the patient begins to move or voluntarily engages in an activity, these tremors are often alleviated or completely resolved. This distinct pattern helps differentiate Parkinson's disease tremors from other types, as they are most prominent at rest.

The permanence or variability of tremors is not accurately captured by the other choices. The tremors are not permanent in the sense that they are affected by a person's activity level, nor do they increase with physical activity. They are not solely present during sleep either, which means that the correct identification of when and how these tremors manifest is crucial for understanding the disease.