This study was aimed at investigating normal subjects walking with support using a robotic device (REHABOT^®) intended for gait training and rehabilitation of physically disabled individuals. Ground reaction forces, knee joint kinematics, temporal factors of gait, and oxygen cost were measured on fourteen healthy subjects. The apparatus was to support 0%, 20%, 40% and 60% of each subject's body weight through an upper torso harness connected to the robotic device. Each subject was then asked to walk on a 10 meter circular pathway. Temporal factors of gait, ground reaction forces and knee kinematic measurements showed little change from 0% to 40%, but a significant alteration in these gait parameters was noticed when 60% of the subject's body weight was supported. Oxygen cost decreased significantly (P<0.05) from 0% to 40%, but increased at 60%. These results suggest that body weight support up to 40% reduces energy demands without significantly altering gait patterns. Consequently the REHABOT^® can be considered as a gait training device for patients with weight-bearing difficulties. This apparatus may also be used as an exercise machine for certain patients who cannot walk un-assisted.