background :rupture of the anterior cruciate ligment (acl) is a common knee injury. the purpose of this study was to determine the balance control in football players with and without acl reconstruction in posture of injury.   methods : sway of the center of gravity of 15 patients with acl reconstruction was compared with 15 healthy, age and sex-matched subjects as the control group. all tests ...

During walking, the body center of mass oscillates along the vertical plane. Its displacement is highest at mid-swing and lowest at terminal swing during the transition to double support. Its vertical velocity (CoMv) has been observed to increase as the center of mass falls between mid- and late swing but is reduced just before double support. This suggests that braking of the center of mass is...

This study presents a new strategy for shake table control that uses direct acceleration feedback without need for displacement feedback. To ensure stability against table drift, force feedback is incorporated. The proposed control strategy was experimentally validated using the shake table at the Johns Hopkins University. Experimental results showed that the proposed control strategy produced ...