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Standing sway: iterative estimation of the kinematics and dynamics of the lower extremities from force-plate measurements

O. Levin, J. Mizrahi, M. Shoham
1998 Biological cybernetics  
In this study, a model for the estimation of the dynamics of the lower extremities in standing sway from force plate data only is presented.  ...  Force-plate data of the reactive forces and centers of pressure were measured bilaterally.  ...  This study was supported by the Segal Foundation and by the Fund for Promotion of Research at the Technion.  ... 
doi:10.1007/s004220050436 pmid:9652081 fatcat:aafd5hxkbvhd5apgiimgyqf5zq

Direct estimation of the parameters of a delayed, intermittent activation feedback model of postural sway during quiet standing

Kevin L. McKee, Michael C. Neale, Jonathan David Touboul
2019 PLoS ONE  
In the model, patterns of sway result from both instantaneous, passive, mechanical resistance and delayed, intermittent resistance signaled by the central nervous system.  ...  A Kalman-Filter framework was designed to directly estimate from experimental data the parameters of the model's stochastic delay differential equations with discrete dynamic switching conditions.  ...  Conclusions We designed and implemented an Extended Kalman Filter-based estimation model of intermittent, delayed feedback control in postural sway and demonstrated that for a variety of stable configurations  ... 
doi:10.1371/journal.pone.0222664 pmid:31527893 pmcid:PMC6748412 fatcat:pm6ih7drg5g2fkyrtwvq7qtuti

Estimation of the 3-d center of mass excursion from force-plate data during standing

F. Barbier, P. Allard, K. Guelton, B. Colobert, A.-P. Godillon-Maquinghen
2003 IEEE transactions on neural systems and rehabilitation engineering  
Financial support was given in part by the Région Nord-Pas de Calais (France), Direction Régionale à la Recherche et à la Technologie, the Association of Colleges and Universities of Canada, the Natural  ...  Sciences and Engineering Research Council of Canada, The Hospital for Sick Children Foundation and by a French NATO Senior Guest Scientist scholarship awarded to Paul Allard.  ...  quiet Estimation of the 3D center of mass excursion from force plate data during standing F.  ... 
doi:10.1109/tnsre.2003.810433 pmid:12797723 fatcat:hquf2pzvvrcdjoibgyhtakam6u

Trunk Acceleration for Neuroprosthetic Control of Standing: A Pilot Study

Raviraj Nataraj, Musa L. Audu, Robert F. Kirsch, Ronald J. Triolo
2012 Journal of Applied Biomechanics  
This pilot study investigated the potential of using trunk acceleration feedback control of center of pressure (COP) against postural disturbances with a standing neuroprosthesis following paralysis.  ...  Correlation coefficients between ANN predictions and actual COP ranged from 0.67 to 0.77.  ...  Acknowledgments The authors would like to acknowledge support from the National Institutes of Health (NIH; #R01 NS040547-04A2) and the Motion Study Laboratory at the Louis Stokes Cleveland Veterans Affairs  ... 
doi:10.1123/jab.28.1.85 fatcat:qivfgpui3jetfelg26todjgmti

Trunk acceleration for neuroprosthetic control of standing: a pilot study

Raviraj Nataraj, Musa L Audu, Robert F Kirsch, Ronald J Triolo
2011 Journal of Applied Biomechanics  
This pilot study investigated the potential of using trunk acceleration feedback control of center of pressure (COP) against postural disturbances with a standing neuroprosthesis following paralysis.  ...  Correlation coefficients between ANN predictions and actual COP ranged from 0.67 to 0.77.  ...  Acknowledgments The authors would like to acknowledge support from the National Institutes of Health (NIH; #R01 NS040547-04A2) and the Motion Study Laboratory at the Louis Stokes Cleveland Veterans Affairs  ... 
pmid:21975251 pmcid:PMC3577928 fatcat:wy3iuamk65gkvowhh4tf47rcxi

The Multivariate Largest Lyapunov Exponent as an Age-Related Metric of Quiet Standing Balance

Kun Liu, Hongrui Wang, Jinzhuang Xiao
2015 Computational and Mathematical Methods in Medicine  
The dynamic multivariate time series of ankle, knee, and hip were measured by multiple electrical goniometers. Thirty-six normal people of different ages participated in the test.  ...  Finally, the results of the proposed approach were analysed and compared with the traditional method, for which the largest Lyapunov exponent and power spectral density from the centre of pressure were  ...  Acknowledgment This work was partly supported by the Natural Science Foundation of Hebei Province of China under Project no. F2014203095.  ... 
doi:10.1155/2015/309756 pmid:26064182 pmcid:PMC4443937 fatcat:njqjeazzgfg7lgbijtcryvy6di

Movement strategies for maintaining standing balance during arm tracking in people with multiple sclerosis

Matthew C. Chua, Allison S. Hyngstrom, Alexander V. Ng, Brian D. Schmit
2014 Journal of Neurophysiology  
Hip and ankle moments and angles during tracking were calculated from kinematic and kinetic measurements.  ...  Full-body kinematics and kinetics were assessed with motion analysis cameras and force plates in nine MS and nine age-matched control subjects.  ...  This movement also re-quired dynamic changes in the trunk and lower extremities to stabilize the body and initiate and assist whole body reaching (Kaminski and Simpkins 2001) .  ... 
doi:10.1152/jn.00598.2013 pmid:24966303 pmcid:PMC4157174 fatcat:3on45dtzsze33bbivyu7nen2ua

Variable Cadence Walking and Ground Adaptive Standing With a Powered Ankle Prosthesis

Amanda H. Shultz, Brian E. Lawson, Michael Goldfarb
2016 IEEE transactions on neural systems and rehabilitation engineering  
Data from standing trials indicate that the user places more weight on the powered prosthesis than on his passive prosthesis when standing on sloped surfaces, particularly at angles of 10 deg or greater  ...  The system is also shown to adapt to slopes over a range of ± 15 deg and to provide support to the user in a manner that is biomimetic, as validated by quasi-static stiffness measurements recorded by the  ...  The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.  ... 
doi:10.1109/tnsre.2015.2428196 pmid:25955789 pmcid:PMC4627943 fatcat:oox7neksizhuzefyu7hqaulea4

Force Shadows: An Online Method to Estimate and Distribute Vertical Ground Reaction Forces from Kinematic Data

Alexander Weidmann, Bertram Taetz, Matthias Andres, Felix Laufer, Gabriele Bleser
2020 Sensors  
We compare our estimations with the measurements of a Zebris pressure plate and obtain correlations of 0.39≤r≤0.94 for double support motions and 0.83≤r≤0.87 for a walking motion.  ...  A major challenge in the reconstruction of GRF from kinematic data is the double support phase, referring to the state with multiple ground contacts.  ...  To avoid the restriction induced by a force plate, inverse dynamics can be used to derive kinetic parameters from kinematic data in order to estimate the current stress on joints during human motion and  ... 
doi:10.3390/s20195709 pmid:33049916 pmcid:PMC7582573 fatcat:y3n5h3d6c5gxtkxmgmykyzjtai

System for Evaluation and Compensation of Leg Length Discrepancy for Human Body Balancing

Zoran Vrhovski, Karlo Obrovac, Josip Nižetić, Alan Mutka, Hrvoje Klobučar, Stjepan Bogdan
2019 Applied Sciences  
Leg Length Discrepancy (LLD) causes a shift of the Center of Mass (CoM) of the human body, as well as an asymmetry in load distribution on the lower extremities.  ...  The human body's CoM is measured with two force plates located on two parallel manipulators.  ...  When the subject is standing on the force plates, the Human Body Balancing starts and the number of iterations k of the HBBA is set to 0.  ... 
doi:10.3390/app9122504 fatcat:j2vnlgwhhvb7lk7boedjyyhdaq

Evaluation of a model that determines the stability limits of dynamic balance

James L Patton, Yi-Chung Pai, Wynne A Lee
1999 Gait & Posture  
A recent model of balance control has revealed two types of boundaries describing stability limits for center of mass (CM) dynamics: torque boundaries and state boundaries.  ...  Moreover, torque safety margins were highly correlated with COP safety margins, supporting the use of COP safety margins for estimating relative stability in dynamic tasks where balance is maintained.  ...  Portions of this paper were presented at the 1997 IEEE Engineering in Medicine and Biology Society Meeting, Chicago.  ... 
doi:10.1016/s0966-6362(98)00037-x pmid:10575069 fatcat:uozfqkg34fby3cbllrvcd47bcu

A real-time topography of maximum contact pressure distribution at medial tibiofemoral knee implant during gait: Application to knee rehabilitation

Marzieh M. Ardestani, Mehran Moazen, Zhenxian Chen, Jing Zhang, Zhongmin Jin
2015 Neurocomputing  
For a number of experimental gait trials, joint kinematics/kinetics and the resultant contact pressure were computed through multi-body dynamic and explicit finite element analyses to establish a training  ...  Although contact pressure can be estimated using finite element analysis, this approach is generally time-consuming and does not satisfy the real-time requirements of a clinical set-up.  ...  Therefore, a number of gait trials, obtained from literature, were imported to multi-body 48 dynamic (MBD) analysis to estimate knee joint kinematics and kinetics.  ... 
doi:10.1016/j.neucom.2014.12.005 fatcat:24fiviql2zasdgim4gcnqdrhse

Variations in Linear and Nonlinear Postural Measurements under Achilles Tendon Vibration and Unstable Support-Surface Conditions

Matthew J. E. Turnock, Charles S. Layne
2009 Journal of Motor Behavior  
In the present study, 20 participants performed a quiet, upright standing task on a stable and sway-referenced support, with and without vibration.  ...  These results suggest that the role of ankle proprioceptive input changes depending on support-surface characteristics and demonstrate the value of using both linear and nonlinear measures of postural  ...  ACKNOWLEDGMENTS The authors wish to thank Sheryl Bishop for her statistical support in this project and Amir Pourmoghaddam for his development of customized Matlab scripts.  ... 
doi:10.1080/00222890903397103 pmid:20018587 fatcat:ebrgzjdg45bnvetu6mv34m4wna

The effects of diabetes and/or peripheral neuropathy in detecting short postural perturbations in mature adults

George D Fulk, Charles J Robinson, Sumona Mondal, Christopher M Storey, Anne M Hollister
2010 Journal of NeuroEngineering and Rehabilitation  
This study explored the effects of diabetes mellitus (DM) and peripheral neuropathy (PN) on the ability to detect near-threshold postural perturbations.  ...  Conclusion: Our findings suggest that PN may not be the only cause of impaired balance in people with DM.  ...  Acknowledgements Funding from the State of Louisiana Board of Regents Fellowship; Merit Review grants from VA Rehabilitation R&D Service Grants #E91-355AP, #E2143PC, #E01-2097R, a VA Senior Rehabilitation  ... 
doi:10.1186/1743-0003-7-44 pmid:20836855 pmcid:PMC2945352 fatcat:auowt72m6rc5vaksqztuwddel4

Adaptation to vibratory perturbations in postural control

P.A. Fransson, R. Johansson, F. Tjernstrom, M. Magnusson
2003 IEEE Engineering in Medicine and Biology Magazine  
He has been the primary investigator and in charge of research in the vestibular lab since 1985 and in charge of clinical work since 1988.  ...  Adaptation to vibratory perturbations in postural control. ish Society of Medicine for distinguished contribution to the study of human balance through application and development of system analysis and  ...  The subjects had no history of vertigo, central nervous disease, or injury to the lower extremities.  ... 
doi:10.1109/memb.2003.1195696 pmid:12733459 fatcat:ubz5cl2hgrarhfib62evmn3x4m
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