PMID: 3730813Aug 1, 1986Paper

Performance of simultaneous movements in patients with Parkinson's disease

Brain : a Journal of Neurology
R BeneckeC D Marsden

Abstract

Ten right-handed patients with Parkinson's disease and 9 normal subjects performed five different types of movements as rapidly as possible in their own time: isotonic elbow flexion through an angle of 15 deg ('flex'); isometric squeezing of a force transducer between thumb and fingers ('squeeze'); isotonic finger flexion ('cut'); simultaneous performance of both 'flex' and 'squeeze'; simultaneous performance of 'flex' and 'cut'. The patients performed the separate movements of 'flex', 'squeeze' and 'cut' more slowly than normals. However, a more striking deficit was seen when a 'flex' and a 'squeeze' had to be performed at the same time, and with the same arm. There was an additional increase in movement times over and above that seen in the separate movements alone. If the patients used both arms ('flex' with the right, 'squeeze' with the left), rather than one, or when a 'flex' and a 'cut' had to be combined in the same arm, only a slight increase in movement times was observed. In normals, however, the speed of individual movements of 'flex', 'squeeze' or 'cut' was the same irrespective of whether they were performed separately or simultaneously. In any one subject, movement times for the separate components of 'flex' and '...Continue Reading

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