An H∞, control model of human postural control in quiet upright standing

2011 ◽  
Author(s):  
Yanhua Yang ◽  
Lili Pei ◽  
Hongyi Li
Keyword(s):  
Postural Control ◽  
Control Model ◽  
Upright Standing

scholarly journals Relation between postural sway magnitude and metabolic energy cost during upright standing on a compliant surface

2015 ◽  
Vol 119 (6) ◽  
pp. 696-703 ◽  
Author(s):  
Han Houdijk ◽  
Starr E. Brown ◽  
Jaap H. van Dieën
Keyword(s):  
Postural Control ◽  
Muscle Activation ◽  
Metabolic Response ◽  
Postural Sway ◽  
Center Of Pressure ◽  
Metabolic Cost ◽  
Optimization Criterion ◽  
Metabolic Energy ◽  
Emg Activity ◽  
Upright Standing

Postural control performance is often described in terms of postural sway magnitude, assuming that lower sway magnitude reflects better performance. However, people do not typically minimize sway magnitude when performing a postural control task. Possibly, other criteria are satisfied when people select the amount of sway they do. Minimal metabolic cost has been suggested as such a criterion. The aim of this study was to experimentally test the relation between sway magnitude and metabolic cost to establish whether metabolic cost could be a potential optimization criterion in postural control. Nineteen healthy subjects engaged in two experiments in which different magnitudes of sway were evoked during upright standing on a foam surface while metabolic energy expenditure, center of pressure (CoP) excursion, and muscle activation were recorded. In one experiment, sway was manipulated by visual feedback of CoP excursion. The other experiment involved verbal instructions of standing still, natural or relaxed. In both experiments, metabolic cost changed with sway magnitude in an asymmetric parabolic fashion, with a minimum around self-selected sway magnitudes and a larger increase at small compared with large sway magnitudes. This metabolic response was paralleled by a change in tonic and phasic EMG activity in the major leg muscles. It is concluded that these results are in line with the notion that metabolic cost can be an optimization criterion used to set postural control and as such could account for the magnitude of naturally occurring postural sway in healthy individuals, although the pathway remains to be elucidated.

scholarly journals A new approach to characterize postural deficits in chemotherapy-induced peripheral neuropathy and to analyze postural adaptions after an exercise intervention

2019 ◽  
Author(s):  
Sarah Kneis ◽  
Anja Wehrle ◽  
Daniela Dalin ◽  
Isabella Katharina Wiesmeier ◽  
Johann Lambeck ◽  
...  
Keyword(s):  
Peripheral Neuropathy ◽  
Postural Control ◽  
Healthy Subjects ◽  
Exercise Intervention ◽  
Sensory Information ◽  
Control Model ◽  
Proprioceptive Information ◽  
New Approach ◽  
External Perturbations ◽  
Before And After

Abstract Background Postural instability presents a common and disabling consequence of chemotherapy-induced peripheral neuropathy (CIPN). However, knowledge about postural behavior of CIPN patients is sparse. With this pilot study, we used a new approach to i) characterize postural impairments as compared to healthy subjects, ii) allocate possible abnormalities to a set of parameters describing sensorimotor function, and iii) evaluate the effects of a balance-based exercise intervention. Methods We analyzed spontaneous and externally perturbed postural control in eight CIPN patients before and after a balance-based exercise intervention by using a modification of an established postural control model. These findings were compared to 15 matched healthy subjects. Results Spontaneous sway amplitude and velocity were larger in CIPN patients compared to healthy subjects. CIPN patients’ reactions to external perturbations were smaller compared to healthy subjects, indicating that patients favor vestibular over proprioceptive sensory information. The balance-based exercise intervention up-weighted proprioceptive information in patients. Conclusions CIPN patients’ major postural deficit may relate to underuse of proprioceptive information that results in a less accurate posture control as spontaneous sway results indicate. The balance-based exercise intervention is able to partially correct for this abnormality. Our study contributes to a better understanding of postural impairments in CIPN patients and suggests an effective treatment strategy.

scholarly journals POSTURAL CONTROL OF THE VISUALLY HANDICAPPED IN MAINTAINING THE UPRIGHT STANDING POSTURE

1981 ◽  
Vol 18 (4) ◽  
pp. 1-10
Author(s):  
YUTAKA TANIMURA ◽  
HIDEO NAKATA ◽  
TETSUU KUROKAWA ◽  
MASAO SEO ◽  
YASUMASA SATO
Keyword(s):  
Postural Control ◽  
Standing Posture ◽  
Upright Standing ◽  
Visually Handicapped

A postural control model incorporating multisensory inputs for maintaining a musculoskeletal model in a stance posture

2016 ◽  
Vol 31 (1-2) ◽  
pp. 55-67 ◽  
Author(s):  
Ping Jiang ◽  
Ryosuke Chiba ◽  
Kaoru Takakusaki ◽  
Jun Ota
Keyword(s):  
Postural Control ◽  
Musculoskeletal Model ◽  
Control Model
Sign in / Sign up

Export Citation Format

Share Document