Biceps brachii tonic vibration reflexes were elicited in patients with either focal or diffuse cerebellar damage and spino-cerebellar degenerations. As compared to normal controls, tonic vibration reflex amplitude was reduced in cerebellar patients, particularly in cases with unilateral hemispheric lesion, who exhibited a clear cut tonic vibration reflex asymmetry even when clinical symptoms were mild. These reflexes were absent or very weak in patients with spino-cerebellar degenerations. Muscle vibration induced in most of the patients an enhancement of mild or latent clinical symptoms such as intention tremor, difficulty in muscle relaxation or motor incoordination.
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