Volitional Suppression of Parkinsonian Resting Tremor

Movement Disorders Clinical Practice
Rebekah L BlakemoreTim J Anderson

Abstract

We have observed in the clinic that a number of patients with Parkinson's disease (PD) can suppress their tremor at will for brief periods, by conscious mental processes. To our knowledge, the ability to consciously diminish one's resting tremor has not yet been reported nor assessed quantitatively. To provide the first detailed systematic investigation of the phenomenon of voluntary tremor suppression in PD. We examined changes in tremor characteristics during voluntary tremor suppression in 37 PD patients (on medication) presenting with rest tremor in their upper limb. We measured tremor oscillations with a triaxis accelerometer on the index finger of the most-affected hand (n = 27). With surface electromyography (EMG), we measured changes in neuromuscular activity of the forearm flexor digitorum superficialis and extensor digitorum muscles (n = 15). Participants completed four 1-minute trials, consisting of alternating consecutive 30-second periods of resting tremor and 30-second periods of attempted tremor suppression. Bayesian multilevel modeling revealed that attempted voluntary tremor suppression did indeed reduce tremor amplitude (peak power) of the acceleration signal and increased tremor frequency of the acceleration ...Continue Reading

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Citations

Dec 18, 2020·Movement Disorders : Official Journal of the Movement Disorder Society·Rok BerlotMaja Kojović

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