PMID: 11912119Mar 26, 2002Paper

Force overflow and levodopa-induced dyskinesias in Parkinson's disease

Brain : a Journal of Neurology
Roland WenzelburgerPaul Krack

Abstract

We assessed force coordination of the hand in Parkinson's disease and its relationship to motor complications of levodopa therapy, particularly to levodopa-induced dyskinesias (LID). We studied two groups of Parkinson's disease patients with (Parkinson's disease + LID, n = 23) and without levodopa-induced dyskinesias (Parkinson's disease - LID, n = 10), and age-matched healthy controls. The motor score of the Unified Parkinson's Disease Rating Scale, a dyskinesia score and force in a grip-lift paradigm were assessed ON and OFF levodopa. A pathological increase of forces was seen in ON-state in Parkinson's disease + LID only. In Parkinson's disease + LID, the force involved in pressing down the object before lifting was significantly increased by levodopa (by 61%, P < 0.05). An overshooting of peak grip force by 51% (P < 0.05) and of static grip force by 45% (P < 0.01) was observed in the ON- compared with the OFF-drug condition. In contrast, no excessive force was found in Parkinson's disease - LID. Peak grip force in ON-state was 140% (P < 0.05) higher in Parkinson's disease + LID than in Parkinson's disease - LID, while static grip force was increased by 138% (P < 0.01) between groups. Severity of peak-dose dyskinesias was st...Continue Reading

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