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Abstract

The purpose of this study was to answer the basic biological question: does cortical control of movement allow for the activation of a single joint when the muscles implicated are placed anatomically to affect more than one articulation and, if so, what muscles are activated? Four normal, adult women performed four trials of volitional elbow and radioulnar movements against gravity and against two weight increments during two experimental settings Simultaneous electrogoniometric and electromyographic data were collected from the two joints and eight muscles sampled. Biplane photographs provided reference points for the analysis of the electromyograms. The results indicated that volitional action at the elbow or radioulnar joint produced involuntary movement at the neighboring articulation with predictable patternings. Muscle participation and range of movement recorded for the involuntary joint actions were augmented by stress.

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Behavior of Independent Joints Served in Part by Muscles Common to Both: Elbow and Radioulnar Joints

Abstract

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