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- W1982362950 abstract "The alterations of voluntary wrist extension movements (30 degree target amplitude, one second movement time) induced by the application of vibration (125 Hz, 0.75 mm peak-to-peak displacement) to a flexor muscle, an antagonist being passively lengthened by active extensor contraction, have been studied in 12 patients with cerebellar dysfunction and an equal number of age-matched healthy subjects. Cerebellar patients generally perform wrist movements inaccu rately : thus, such movements are suitable for investigating the abnormalities of the rate and range (dysmetria) of their movements. Vibration elicited a significant reduction in the end-position of the relatively slow movements investigated, and a consequent undershooting of target trajectories in both patients and control subjects ( p < 0.01, Wilcoxon test). The extent of vibration-induced undershooting was similar in the two groups. Nonvibrated extension movements were produced in both groups by progressive increases in extensor (prime- mover) electromyographic (EMG) activity with little antagonist co-contraction. Vibration-induced undershooting resulted principally from a sustained reduction in extensor activity. These findings support two main conclusions. First, the dysmetria shown by our patients cannot be simply attributed to the failure of a proprioceptive feedback loop. Secondly, the provision of vibratory stimulators, controlled by goniometers sensing joint angle, is a potentially viable approach to counteracting cerebellar dysmetria, e.g. by limiting excessive movement in certain situations." @default.
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- W1982362950 date "1993-11-01" @default.
- W1982362950 modified "2023-09-25" @default.
- W1982362950 title "Muscle vibration alters the trajectories of voluntary movements in cerebellar disorders — a method of counteracting impaired movement accuracy?" @default.
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- W1982362950 doi "https://doi.org/10.1177/026921559300700409" @default.
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