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balance motor control time series

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https://www.readbyqxmd.com/read/27878377/relationship-between-the-plasma-levels-of-neurodegenerative-proteins-and-motor-subtypes-of-parkinson-s-disease
#1
Jian Ding, Jiejin Zhang, Xixi Wang, Li Zhang, Siming Jiang, Yongsheng Yuan, Junyi Li, Lin Zhu, Kezhong Zhang
The aim of our study is to examine the plasma levels of the four kinds of neurodegenerative proteins in plasma: α-syn, T-tau, P-tau181, and Aβ-42 in Parkinson's disease (PD) and to evaluate the relationship between their plasma levels and PD motor subtypes. 84 patients with PD were enrolled in our study, and finally, 73 of them were classified into the tremor-dominant subtype (TD) and the postural instability gait difficulty subtype (PIGD). Their motor performance was evaluated by a series of clinical assessments: Freezing of Gait Questionnaire (FOGQ), Timed Up and Go (TUGs), Tinetti balance, and Tinetti gait...
November 22, 2016: Journal of Neural Transmission
https://www.readbyqxmd.com/read/26737860/comparison-between-decision-tree-and-genetic-programming-to-distinguish-healthy-from-stroke-postural-sway-patterns
#2
COMPARATIVE STUDY
Luiz H G Marrega, Simone M Silva, Elisangela F Manffra, Julio C Nievola
Maintaining balance is a motor task of crucial importance for humans to perform their daily activities safely and independently. Studies in the field of Artificial Intelligence have considered different classification methods in order to distinguish healthy subjects from patients with certain motor disorders based on their postural strategies during the balance control. The main purpose of this paper is to compare the performance between Decision Tree (DT) and Genetic Programming (GP) - both classification methods of easy interpretation by health professionals - to distinguish postural sway patterns produced by healthy and stroke individuals based on 16 widely used posturographic variables...
2015: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/26737100/extraction-of-traditional-cop-based-features-from-com-sway-in-postural-stability-evaluation
#3
F Romano, P Colagiorgio, A Buizza, F Sardi, S Ramat
Postural control during quiet standing is evaluated by analyzing CoP sway, easily measured using a force platform. However, recent proliferation of motion tracking systems made easily available an estimate of the CoM location. Traditional CoP-based measures presented in literature provide information about age-related changes in postural stability and fall risk. We investigated, on an age-matched group of subjects, the relationship between classical CoP-based measures computed on sway path and statistical mechanics parameters on diffusion plot, with those extracted from CoM time-series...
August 2015: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/26636079/on-the-origin-of-muscle-synergies-invariant-balance-in-the-co-activation-of-agonist-and-antagonist-muscle-pairs
#4
Hiroaki Hirai, Fumio Miyazaki, Hiroaki Naritomi, Keitaro Koba, Takanori Oku, Kanna Uno, Mitsunori Uemura, Tomoki Nishi, Masayuki Kageyama, Hermano Igo Krebs
Investigation of neural representation of movement planning has attracted the attention of neuroscientists, as it may reveal the sensorimotor transformation essential to motor control. The analysis of muscle synergies based on the activity of agonist-antagonist (AA) muscle pairs may provide insight into such transformations, especially for a reference frame in the muscle space. In this study, we examined the AA concept using the following explanatory variables: the AA ratio, which is related to the equilibrium-joint angle, and the AA sum, which is associated with joint stiffness...
2015: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/26582165/changes-in-multifidus-and-abdominal-muscle-size-in-response-to-microgravity-possible-implications-for-low-back-pain-research
#5
J A Hides, G Lambrecht, W R Stanton, V Damann
PURPOSE: In microgravity, muscle atrophy occurs in the intrinsic muscles of the spine, with changes also observed in the abdominal muscles. Exercises are undertaken on the International Space Station and on Earth following space flight to remediate these effects. Similar effects have been seen on Earth in prolonged bed rest studies and in people with low back pain (LBP). The aim of this case report was to examine the effects of microgravity, exercise in microgravity and post-flight rehabilitation on the size of the multifidus and antero-lateral abdominal muscles...
May 2016: European Spine Journal
https://www.readbyqxmd.com/read/26303025/time-scale-dependence-of-the-center-of-pressure-entropy-what-characteristics-of-the-neuromuscular-postural-control-system-influence-stabilographic-entropic-half-life
#6
Peter Federolf, Payam Zandiyeh, Vinzenz von Tscharner
The center of pressure (COP) movement in studies of postural control reveals a highly regular structure (low entropy) over short time periods and a highly irregular structure over large time scales (high entropy). Entropic half-life (EnHL) is a novel measure that quantifies the time over which short-term temporal correlations in a time series deteriorate to an uncorrelated, random structure. The current study suggested and tested three hypotheses about how characteristics of the neuromuscular postural control system may affect stabilometric EnHL: (H1) control system activity hypothesis: EnHL decreases with increased frequency of control system interventions adjusting COP motion; (H2) abundance of states hypothesis: EnHL decreases with increased number of mechanically equivalent states available to the postural system; and (H3) neurologic process hierarchy hypothesis: EnHL increases if postural control functions shift from the spinal level to the motor cortex...
December 2015: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/26288232/reduced-cognitive-motor-interference-on-voluntary-balance-control-in-older-tai-chi-practitioners
#7
Rini Varghese, Christina W Y Hui-Chan, Tanvi Bhatt
BACKGROUND AND PURPOSE: Recent dual-task studies suggest that Tai Chi practitioners displayed better control of standing posture and maintained a quicker response time of postural muscle activation during a stepping down activity. Whether this effect extends to voluntary balance control, specifically the limits of excursion of the center of pressure, remains to be examined. The purpose of this study was to evaluate the cognitive-motor interference pattern by examining the effects of a concurrently performed cognitive task on attention of voluntary balance control in older adults who are long-term practitioners of Tai Chi...
October 2016: Journal of Geriatric Physical Therapy
https://www.readbyqxmd.com/read/26016403/what-cop-and-kinematic-parameters-better-characterize-postural-control-in-standing-balance-tasks
#8
Carla Caballero, David Barbado, Francisco Javier Moreno
The authors' aim was to determine which variables allow for the characterization of motor balance behavior. Traditional measures and nonlinear measures of center of pressure (COP; n = 30) and kinematics (n = 10) were tested in their absolute and relative consistency in a 30-s standing balance task protocol under stable and unstable conditions. Regarding COP variables, mean velocity (mVel), permutation entropy (PE) and detrended fluctuation analysis (DFA) exhibited high consistency between trials and ranked individuals more accurately compare with other metrics...
2015: Journal of Motor Behavior
https://www.readbyqxmd.com/read/25019712/multiplicative-cascade-dynamics-in-pole-balancing
#9
Henry S Harrison, Damian G Kelty-Stephen, Daniela V Vaz, Claire F Michaels
Pole balancing is a key task for probing the prospective control that organisms must engage in for purposeful action. The temporal structure of pole-balancing behaviors will reflect the on-line operation of control mechanisms needed to maintain an upright posture. In this study, signatures of multifractality are sought and found in time series of the vertical angle of a pole balanced on the fingertip. Comparisons to surrogate time series reveal multiplicative-cascade dynamics and interactivity across scales...
June 2014: Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
https://www.readbyqxmd.com/read/24903116/postural-complexity-influences-development-in-infants-born-preterm-with-brain-injury-relating-perception-action-theory-to-3-cases
#10
Stacey C Dusing, Theresa Izzo, Leroy R Thacker, James Cole Galloway
BACKGROUND AND PURPOSE: Perception-action theory suggests a cyclical relationship between movement and perceptual information. In this case series, changes in postural complexity were used to quantify an infant's action and perception during the development of early motor behaviors. CASE DESCRIPTION: Three infants born preterm with periventricular white matter injury were included. OUTCOMES: Longitudinal changes in postural complexity (approximate entropy of the center of pressure), head control, reaching, and global development, measured with the Test of Infant Motor Performance and the Bayley Scales of Infant and Toddler Development, were assessed every 0...
October 2014: Physical Therapy
https://www.readbyqxmd.com/read/24728178/postural-stability-in-young-adults-with-down-syndrome-in-challenging-conditions
#11
Ewa Bieć, Joanna Zima, Dorota Wójtowicz, Bożena Wojciechowska-Maszkowska, Krzysztof Kręcisz, Michał Kuczyński
To evaluate postural control and performance in subjects with Down syndrome (SwDS), we measured postural sway (COP) in quiet stance in four 20-second tests: with eyes open or closed and on hard or foam surface. Ten SwDS and eleven healthy subjects participated, aged 29.8 (4.8) and 28.4 (3.9), respectively. The time-series recorded with the sampling rate of 100 Hz were used to evaluate postural performance (COP amplitude and mean velocity) and strategies (COP frequency, fractal dimension and entropy). There were no intergroup differences in the amplitude except the stance on foam pad with eyes open when SwDS had larger sway...
2014: PloS One
https://www.readbyqxmd.com/read/24557655/application-of-lsvt-big-intervention-to-address-gait-balance-bed-mobility-and-dexterity-in-people-with-parkinson-disease-a-case-series
#12
Jorina Janssens, Klaartje Malfroid, Thomas Nyffeler, Stephan Bohlhalter, Tim Vanbellingen
BACKGROUND AND PURPOSE: Lee Silverman Voice Treatment Big (LSVT BIG) is characterized by intensive exercising of high-amplitude movements to overcome bradykinesia and hypokinesia in patients with Parkinson disease (PD). The aim of the present case series was to explore possible beneficial effects of LSVT BIG training on gait, balance, bed mobility, and dexterity. CASE DESCRIPTION: Three patients with mild to moderate PD (all male; aged 52, 54, and 70 years; Hoehn & Yahr stages I-III) completed a 4-week LSVT BIG training program (16 individual 1-hour sessions) and an intensive home training program in accordance with the LSVT BIG protocol...
July 2014: Physical Therapy
https://www.readbyqxmd.com/read/24476805/robot-assisted-gait-training-improves-motor-performances-and-modifies-motor-unit-firing-in-poststroke-patients
#13
C Chisari, F Bertolucci, V Monaco, M Venturi, C Simonella, S Micera, B Rossi
BACKGROUND: Robotics and related technologies are realizing their promise to improve the delivery of rehabilitation therapy but the mechanism by which they enhance recovery is still unknown. The electromechanical-driven gait orthosis Lokomat has demonstrated its utility for gait rehabilitation after stroke. AIM: To test the efficacy of Lokomat in gait retraining and to investigate the neurophysiological mechanisms underlying the recovery process. DESIGN: Case series study...
February 2015: European Journal of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/24469903/evaluation-of-the-impact-of-6-month-training-by-whole-body-vibration-on-the-risk-of-falls-among-nursing-home-residents-observed-over-a-12-month-period-a-single-blind-randomized-controlled-trial
#14
RANDOMIZED CONTROLLED TRIAL
F Buckinx, C Beaudart, D Maquet, M Demonceau, J M Crielaard, J Y Reginster, O Bruyère
BACKGROUND: We have previously shown that short sessions of whole body vibration (WBV) were not able to significantly improve fall risk among nursing home residents but some trends towards an improvement of motor capacity were observed. OBJECTIVE: The objective of the present study was to evaluate the impact of 6-month training by WBV on functional and motor abilities among nursing home residents observed over a 12-month period. METHODS: Patients were randomized into two groups: the WBV group which received three training sessions every week composed of five series of 15 s of vibration at 30 Hz intensity for a period of 6 months and a control group with normal daily life...
August 2014: Aging Clinical and Experimental Research
https://www.readbyqxmd.com/read/24374058/particular-adaptations-to-potentially-slippery-surfaces-the-effects-of-friction-on-consecutive-postural-adjustments-cpa
#15
Sahel Memari, Serge Le Bozec, Simon Bouisset
This research deals with the postural adjustments that occur after the end of voluntary movement ("consecutive postural adjustments": CPAs). The influence of a potentially slippery surface on CPA characteristics was considered, with the aim of exploring more deeply the postural component of the task-movement. Seven male adults were asked to perform a single step, as quickly as possible, to their own footprint marked on the ground. A force plate measured the resultant reaction forces along the antero-posterior axis (R(x)) and the centre of pressure (COP) displacements along the antero-posterior and lateral axes (Xp and Yp)...
February 21, 2014: Neuroscience Letters
https://www.readbyqxmd.com/read/24363337/use-of-the-challenge-point-framework-to-guide-motor-learning-of-stepping-reactions-for-improved-balance-control-in-people-with-stroke-a-case-series
#16
Courtney L Pollock, Lara A Boyd, Michael A Hunt, S Jayne Garland
BACKGROUND AND PURPOSE: Stepping reactions are important for walking balance and community-level mobility. Stepping reactions of people with stroke are characterized by slow reaction times, poor coordination of motor responses, and low amplitude of movements, which may contribute to their decreased ability to recover their balance when challenged. An important aspect of rehabilitation of mobility after stroke is optimizing the motor learning associated with retraining effective stepping reactions...
April 2014: Physical Therapy
https://www.readbyqxmd.com/read/24259702/effective-anticoagulation-for-a-percutaneous-ventricular-assist-device-using-a-heparin-based-purge-solution
#17
Douglas L Jennings, Carrie W Nemerovski, James S Kalus
OBJECTIVE: To report on a series of patients who were successfully anticoagulated with a novel protocol including a heparin-based purge solution. CASE SUMMARY: Four patients were supported for a total of 300 hours on the new Impella anticoagulation protocol, which was based on our current nurse-driven cardiology heparin protocol. Three patients were in cardiogenic shock after acute myocardial infarction, and 1 patient was in shock from severe aortic valvular disease...
October 2013: Annals of Pharmacotherapy
https://www.readbyqxmd.com/read/24231287/compressing-movement-information-via-principal-components-analysis-pca-contrasting-outcomes-from-the-time-and-frequency-domains
#18
Peter C M Molenaar, Zheng Wang, Karl M Newell
PCA has become an increasingly used analysis technique in the movement domain to reveal patterns in data of various kinds (e.g., kinematics, kinetics, EEG, EMG) and to compress the dimension of the multivariate data set recorded. It appears that virtually all movement related PCA analyses have, however, been conducted in the time domain (PCAt). This standard approach can be biased when there are lead-lag (phase-related) properties to the multivariate time series data. Here we show through theoretical derivation and analysis of simulated and experimental postural kinematics data sets that PCAt and, PCA in the frequency domain (PCAf), can lead to contrasting determinations of the dimension of a data set, with the tendency of PCAt to overestimate the number of components...
December 2013: Human Movement Science
https://www.readbyqxmd.com/read/24055362/effect-of-altered-surfaces-on-postural-sway-characteristics-in-elderly-subjects
#19
M Kirchner, P Schubert, T Getrost, C T Haas
Mobility is essentially based on successful balance control. The evaluation of functional strategies for postural stability is requisite for effective balance rehabilitation and fall prevention in elderly subjects. Our objective was to clarify control mechanisms of different standing positions reflecting challenges of typical everyday life situations. For this purpose, elderly subjects stood on different surfaces resulting in a change of the biomechanical constraints. Sway parameters out of time and frequency domain were calculated from center-of-pressure (COP) excursions...
December 2013: Human Movement Science
https://www.readbyqxmd.com/read/23949083/muscle-synergies-with-walkaround%C3%A2-postural-support-vs-cane-therapist-assistance
#20
Nadica Miljković, Ivana Milovanović, Aleksandra Dragin, Ljubica Konstantinović, Dejan B Popović
BACKGROUND: The main clinical measures of walking recovery in stroke patients were compared for training assisted by Walkaround® postural support (WPS) and conventional (CON) support by a cane/therapist. OBJECTIVE: We attributed the differences between the trainings to modified muscular synergies that occurred during assistance by WPS. METHODS: We studied the muscle activities of the primary knee and ankle joint movers in the paretic and non-paretic legs of sub-acute stroke patients during assisted walking with WPS and CON...
2013: NeuroRehabilitation
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