Our overall goal is to develop therapeutic interventions to improve upper-limb motor function in hemiparetic persons based on an improved understanding of the mechanisms responsible for its loss and recovery. We intend to rigorously evaluate the efficacy of these interventions with clinical trials, and to study the mechanisms by which these interventions affect motor recovery. In this proposal, we will use a controlled, randomized, double blind clinical trial to study the effects of shoulder and elbow strength training in subjects in the subacute phase of recovery following stroke.