Maintaining upright posture under external perturbations requires the coordination between the nervous system and the musculoskeletal system, and it is a milestone of motor development in early childhood. Whole-body vibration (WBV) has acute effect on postural control and muscular activation during standing, resulting in an increased sway velocity and sway area of center-of-mass (COM), and the residual effect usually vanishes within 20 minutes after the vibration exposure. In quiet standing, a human body can be considered as a multi-segment linked system, and an uncontrolled manifold (UCM) approach has been used to examine how this multi-joint motor redundancy is utilized to achieve postural control of the body. The aim of this study was to compare the joint variance structure between children and adults while controlling the COM before, during, and after WBV disturbance.
Liang H & Wu J. Center of mass control and multi-segment coordination in children during and after whole-body vibration. Poster presentation at the 41th American Society of Biomechanics annual meeting, Boulder, CO, August 8-11, 2017.