What is a characteristic feature of a resting tremor?

A resting tremor is characterized by its presence when the affected body part is at rest and generally absent when the limb is actively engaged or fully supported. This tremor often occurs in conditions like Parkinson's disease and is most noticeable when the patient is relaxed and not using the affected muscles. The fact that it is absent when the body part is supported further emphasizes this characteristic; when the limb is stabilized or not under muscular effort, the tremor should diminish or cease entirely.

This distinction is vital as resting tremors specifically highlight that the involuntary movement is not triggered by actions or tasks, which is a key diagnostic feature for practitioners assessing for neurological disorders.