Effect of load perturbations on EMG activity and trajectories of pointing movements.
Force perturbations were applied to the upper arm during pointing movements to a target. Following the perturbation, the trajectories of shoulder and elbow angular velocities converged on those obtained during trials in which no perturbation was imposed, but with a temporal offset. Changes in EMG activity in shoulder and elbow flexors evoked by the perturbation were similar to those observed previously under quasi-static conditions, the change in a given muscle depending on shoulder and elbow motion.
Soechting
J F
JF
Laboratory of Neurophysiology, University of Minnesota, Minneapolis 55455.
D001132:Arm / Q000502:physiology*; D001696:Biomechanical Phenomena; D004576:Electromyography; D006801:Humans; D009132:Muscles / Q000502:physiology*