Postural feedback responses scale with biomechanical constraints in human standing.

Postural feedback responses scale with biomechanical constraints in human standing. Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

Postural feedback responses scale with biomechanical constraints in human standing. Abstract Text:

Sukyung Park,Fay B Horak,Arthur D Kuo,

We tested whether human postural responses can be described in terms of feedback control gains, and whether these gains are scaled by the central nervous system to accommodate biomechanical constraints. A feedback control model can describe postural responses for a wide range of perturbations, but biomechanical constraints-such as on the torque that can be exerted on the ground-make a single set of feedback gains inappropriate for all perturbations. To observe how postural responses change with perturbation magnitude, we applied fast, backward perturbations of magnitudes 3-15 cm to 13 healthy young volunteers (4 men, 9 women, aged 20-32 years). We used a 3-segment, sagittal-plane biomechanical model and a linear state feedback controller to reproduce the observed postural responses. Optimization was used to identify the best-fit feedback control gains for each trial. Results showed that trajectories of joint angles and joint torques were scaled with perturbation magnitude. This scaling occurred gradually, rather than abruptly changing at magnitudes where biomechanical constraints became active. Feedback gains were found to fit reasonably well with data ( R(2)=0.92) and to be multivariate and heterogenic in character, meaning that the torque produced at any joint is generally a function of motions not only at the same joint, but other joints as well. Hip gains increased and ankle gains decreased nearly linearly with perturbation magnitude, in accordance with biomechanical limitations on ground reaction torque. These results indicate that postural adjustments can be described as a single feedback control scheme, with scalable heterogenic gains that are adjusted according to biomechanical constraints.

Postural feedback responses scale with biomechanical constraints in human standing. Publishing Authors By Initials

S Park,FB Horak,AD Kuo,

For similar musculoskeletal, neural, and ocular physiology: musculoskeletal physiology: musculoskeletal physiologic phenomena: posture research abstracts see: musculoskeletal, neural, and ocular physiology: musculoskeletal physiology: musculoskeletal physiologic phenomena: posture research

PUBMED ID PMID:

MEDLINE DATE:

Postural feedback responses scale with biomechanical constraints in human standing. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Experimental brain research. Experimentelle Hirnfo

VOLUME: 154

Page Numbers: 417-27

Journal Abbreviation:

ISSN: 0014-4819

DAY: 14

MONTH: 11

YEAR: 2003

Postural feedback responses scale with biomechanical constraints in human standing. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 43312

Postural feedback responses scale with biomechanical constraints in human standing. Keywords Mesh Terms:

KEYWORDS: Posture

MESH TERMS: physiology

Chemical & Substance for Abstract: Postural feedback responses scale with biomechanical constraints in human standing. Information

Substance Name:

Registry Number:

Grant and Affiliation Information for Postural feedback responses scale with biomechanical constraints in human standing.

AFFILIATION: Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109-2125, USA. sukyung_park@meei.harvard.edu

Country: Germany

AGENCY:

GRANT:

ACRONYM:

MEDLINETA: Exp Brain Res

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

Postural feedback responses scale with biomechanical constraints in human standing Related Publications

• (-)-Fargesol, A New Lignan from the Flowers Buds of Magnolia fargesii.
• A FIELD SURVEY OF ARTHROPOD PARASITES OF BIRDS IN TAIWAN.
• A Novel Morphinandienone Alkaloid from Fissistigma oldhamii.
• A Possible Link Between Exercise-training Adaptation And Dehydroepiandrosterone Sulfate- An Oldest-old Female Study: 1590: Board #80 May 30 3:30 PM - 5:00 PM.
• Alpha-tocopherol acetate significantly suppressed the increase in heart interstitial 8-hydroxydeoxyguanosine following myocardial ischemia and reperfusion in anesthetized rats.
• Characterization of the PC4 binding domain and its interactions with HNF4alpha.
• Cotinine characterization and quality effect of sperm for smoking and nonsmoking students.
• Do content and format affect older consumers' use of comparative information in a Medicare health plan choice? Results from a controlled experiment.
• Effect Of Ambient Oxygen Status On Liver And Muscle Glycogen Storages During Post-exercise Recovery Period: 1761: Board #49 May 31 9:00 AM 10:30 AM.
• Effect Of Dehydroepiandrosterone Administration On Recovery Capacity During Training Session In Male Badminton Players: 2581: Board #128 June 2 9:30 AM - 11:00 AM.
• Effect of detrusor function on the therapeutic outcome of a suburethral sling procedure using a polypropylene sling for stress urinary incontinence in women.
• Exercise training restores coronary arteriolar dilation to NOS activation distal to coronary artery occlusion: role of hydrogen peroxide.
• Extracellular proton-modulated pore-blocking effect of the anticonvulsant felbamate on NMDA channels.
• Extramedullary hemopoiesis with littoral cell angioma involving main and accessory spleens.
• Field theory in two-time physics with N=1 supersymmetry.
• Glucose Tolerance And Insulin Sensitivity Following A 1-week Volleyball Competition: 1754: Board #42 May 31 9:00 AM 10:30 AM.
• Molecular cloning and gene expression of the gonadotropin-releasing hormone receptor in the orange-spotted grouper, Epinephelus coioides.
• Osteopontin induces ubiquitin-dependent degradation of STAT1 in RAW264.7 murine macrophages.
• Piceatannol stimulates osteoblast differentiation that may be mediated by increased bone morphogenetic protein-2 production.
• Prader-Willi syndrome in Taiwan.
• QT interval is prolonged but QT dispersion is maintained in patients with primary aldosteronism.
• Simulation of water quality and plankton dynamics in the Danshuei River estuary, Taiwan.
• Sp1 regulates osteopontin expression in SW480 human colon adenocarcinoma cells.
• Tanshinlactone A from Salvia miltiorrhiza modulates interleukin-2 and interferon-gamma gene expression.
• The Magnitude of Physiological Response to Altitude is Associated with Individual Variation in DHEA-S Levels: 925: June 1 4:30 PM - 4:45 PM.
• The advantages of a rolling foot in human walking.
• Using finger tip blood as a diabetes prevention tool: 1536: board #26 may 30 2:00 PM - 3:30 PM.
• Vascular endothelial growth factor: biology and therapeutic applications.
• Vehicle and enhancer effects on human skin penetration of aminophylline from cream formulations: evaluation in vivo.
• Visual and haptic feedback contribute to tuning and online control during object manipulation.