The Kinesthetic Ability Trainer (KAT; LLC,Vista, CA, USA) is a balance and training system that provides visual feedback to control body posture on a movable platform. The KAT system works by altering the stability of a movable platform, on which an individual stands, and/or by varying the degree to which they alter their base of support by shifting their weight in response to visual feedback provided by apersonal computer, in addition to the therapist’s guidance,encouragement and feedback. The use of visual motion and active motion of the trunk muscles in UN rehabilitation have been reported previously (15, 16).Although the KAT has been shown to be effective in improving balance in stroke patients, its effects on UNhave not been investigated previously (17).The aim of this study was to investigate the effects of the KAT on UN and functional outcomes in patients with stroke in a rehabilitation setting. We hypothesized that KAT as an adjunct to a conventional rehabilitation programme would result in better outcomes thanconventional therapy alone.