The electromyographic activity in paretic and nonparetic elbow muscle was evaluated during graded isometric contractions in different directions. The range of direction in which a given muscle is active as well as the direction of peak activity of the muscle were very similar when tested among nonparetic limbs. In contrast, these parameters were observed to be variable among paretic muscles. An index of the degree of disturbance in directional selectivity was calculated for the paretic limb and was found to be inversly related to the degree of motor performance of the upper limb as evaluated clinically. These results suggest that, in hemiparesis, the directional selectivity of muscle activation is perturbed and leads to impairment of functional use of the arm.
|Original language||English (US)|
|Title of host publication||Unknown Host Publication Title|
|Number of pages||2|
|State||Published - Dec 1 1987|
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