Background. One ofthe key components ofpostural control is the motor system's ability to produce appropriate torques to counteract perturbations that may lead to a loss of balance. Evidence exists to show that there is an age-related decline in absolute strength and in the ability to rapidly produce torque. The relationship between age-related decreases in these voluntary torque production capa...

We design the controls of physical systems that are faced by uncertainties. The system dynamics described random hyperbolic balance laws. control aims to steer a desired state under propose based on Lyapunov stability analysis suitable series expansion dynamics. damps impact uncertainties exponentially fast in time. presented approach can be applied large class and perturbations, as~e.g.~Gaussi...

Balance disorders are very frequent in Parkinson’s disease (PD). One-leg stance performance is a predictor of fall risk. We investigated one-leg strategies people with PD. hypothesized that patients would choose, and better perform on, the leg on least affected body side. Fifty participants 2 to 19 years PD duration stood one while ON medication. The spontaneously chosen was recorded. Performan...

The goal of this study was to investigate the control strategy employed by gymnasts in maintaining a hand balance. It was hypothesized that a "wrist strategy" was used in which perturbations in the sagittal plane were corrected using variations in wrist flexor torque with synergistic shoulder and hip torques acting to preserve a fixed body configuration. A theoretical model of wrist strategy in...

This communication provides an update of our understanding of the neurological bases for the close association between balance control and anxiety. New data suggest that a vestibulo-recipient region of the parabrachial nucleus (PBN) contains cells that respond to body rotation and position relative to gravity. The PBN, with its reciprocal relationships with the extended central amygdaloid nucle...