Orthostatic Tremor during Modification of Stance

Introduction: The primary orthostatic tremor (OT) is a fast tremor occurring only in the standing position. We have now studied whether OT is influenced by modification of the condition „stance“. Patients and Methods: We investigated 7 patients with primary OT (age 46–77 years, median 68 years). All patients revealed a 14–18/s tremor in the muscles of both legs during standing. The tremor activity was analyzed under different conditions: 1) Relief of the body weight to 75%, 50%, 25% and 0% (complete relief of the body weight, the patient's feet still touched the bottom) by vertical elevation of the patient. 2) R…