Assisted movement and muscle vibration , combined with either EMG or torque biofeedback , appears to reduce upper limb impairment , improve volitional activation of the hand muscles , and restore a modicum of hand function in some persons with severe hand impairment due to chronic stroke.Video Abstract available ( see Video , Supplemental Digital Content 1 , http://links.lww.com/JNPT/A64 ) for more insights from the authors .