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Effects of Hand Vibration on Motor Output in Chronic Hemiparesis


Affiliations
1 School of Rehabilitation, Faculty of Medicine, Universite de Montreal, Canada
2 Center for Interdisciplinary Research in Rehabilitation, Institut de Readaptation de Montreal, Montreal, QC, Canada
 

Background: Muscle vibration has been shown to increase the corticospinal excitability assessed by transcranial magnetic stimulation (TMS) and to change voluntary force production in healthy subjects. Objectives: To evaluate the effect of vibration on corticospinal excitability using TMS and on maximal motor output using maximal voluntary contraction (MVC) in individuals with chronic hemiparesis. Methodology: Nineteen hemiparetic and 17 healthy control subjects participated in this study. Motor evoked potentials (MEPs) and MVC during lateral pinch grip were recorded at first dorsal interosseous muscle in a single session before, during, and after one-minute trials of 80Hz vibration of the thenar eminence. Results: In hemiparetic subjects, vibration increasedMEP amplitudes to a level comparable to that of control subjects and triggered aMEP response in 4 of 7 patients who did not have aMEP at rest. Also, vibration increased the maximal rate of force production (dF/dtmax) in both control and hemiparetic subjects but it didnot increase MVC. Conclusion: Motor response generated with a descending cortical drive in chronic hemiparetic subjects can be increased during vibration. Vibration could be used when additional input is needed to reveal motor responses and to increase rate of force generation.
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  • Effects of Hand Vibration on Motor Output in Chronic Hemiparesis

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Authors

Sibele de Andrade Melo
School of Rehabilitation, Faculty of Medicine, Universite de Montreal, Canada
Andreea Iancu
Center for Interdisciplinary Research in Rehabilitation, Institut de Readaptation de Montreal, Montreal, QC, Canada
Joseph-Omer Dyer
School of Rehabilitation, Faculty of Medicine, Universite de Montreal, Canada
Robert Forget
School of Rehabilitation, Faculty of Medicine, Universite de Montreal, Canada

Abstract


Background: Muscle vibration has been shown to increase the corticospinal excitability assessed by transcranial magnetic stimulation (TMS) and to change voluntary force production in healthy subjects. Objectives: To evaluate the effect of vibration on corticospinal excitability using TMS and on maximal motor output using maximal voluntary contraction (MVC) in individuals with chronic hemiparesis. Methodology: Nineteen hemiparetic and 17 healthy control subjects participated in this study. Motor evoked potentials (MEPs) and MVC during lateral pinch grip were recorded at first dorsal interosseous muscle in a single session before, during, and after one-minute trials of 80Hz vibration of the thenar eminence. Results: In hemiparetic subjects, vibration increasedMEP amplitudes to a level comparable to that of control subjects and triggered aMEP response in 4 of 7 patients who did not have aMEP at rest. Also, vibration increased the maximal rate of force production (dF/dtmax) in both control and hemiparetic subjects but it didnot increase MVC. Conclusion: Motor response generated with a descending cortical drive in chronic hemiparetic subjects can be increased during vibration. Vibration could be used when additional input is needed to reveal motor responses and to increase rate of force generation.