Strength training can improve steadiness in persons with essential tremor

Area of Science:

• Neurology
• Rehabilitation Science
• Movement Disorders

Background:

• Essential tremor (ET) is a common neurological disorder characterized by involuntary rhythmic shaking.
• Impaired motor control and reduced force steadiness are significant challenges for individuals with ET.
• The potential benefits of strength training on tremor severity and motor function in ET remain under investigation.

Purpose of the Study:

• To investigate the impact of a strength-training program on the ability to exert steady forces in individuals with essential tremor.
• To compare the effects of heavy-load versus light-load strength training on tremor-related motor control.

Main Methods:

• Thirteen participants diagnosed with essential tremor were divided into three groups: heavy-load training, light-load training, and a control group (no training).
• Participants performed postural and constant-force tasks requiring steady index finger contractions.
• Force steadiness was measured using acceleration amplitude (postural tasks) and force variability metrics (constant-force tasks).

Main Results:

• The group undergoing heavy-load strength training demonstrated significant improvements in force steadiness during constant-force tasks.
• No significant changes in force steadiness were observed in the light-load training or control groups.
• Despite improved steadiness, no associated improvements in functional abilities were noted across any group.

Conclusions:

• Heavy-load strength training can effectively reduce tremor magnitude, specifically improving force steadiness in individuals with essential tremor.
• The observed improvements in tremor steadiness did not generalize to enhanced functional performance.
• Further research is warranted to explore the efficacy of different training paradigms and their impact on functional outcomes in ET.