[Systematic positioning errors and electromyographic activity of muscles in the human single-joint movements].

Accuracy of positioning was studied on the elbow joint movements in healthy adult humans. Individual trials consisted of the conditioning and test movements (CM, TM) produced with visual guidance and without it, correspondingly. The two types of CMs included a phase of slow movement (flexion - P1, or extension - P2) to the same target position (50 degrees in the most experiments).