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https://www.readbyqxmd.com/read/28335461/design-and-validation-of-a-low-cost-portable-device-to-quantify-postural-stability
#1
Yong Zhu
Measurement of the displacement of the center-of-pressure (COP) is an important tool used in biomechanics to assess postural stability and human balance. The goal of this research was to design and validate a low-cost portable device that can offer a quick indication of the state of postural stability and human balance related conditions. Approximate entropy (ApEn) values reflecting the amount of irregularity hiding in COP oscillations were used to calculate the index. The prototype adopted a portable design using the measurements of the load cells located at the four corners of a low-cost force platform...
March 18, 2017: Sensors
https://www.readbyqxmd.com/read/28320152/electrographic-patterns-in-patients-with-posterior-reversible-encephalopathy-syndrome-and-seizures
#2
Carlos Kamiya-Matsuoka, Sudhakar Tummala
INTRODUCTION: Posterior reversible encephalopathy syndrome (PRES) is a neurotoxic encephalopathic state associated with reversible cerebral vasogenic edema. Seizures are a common clinical presentation in PRES, however its electroencephalographic and radiologic pattern correlation is limited in this subset of patients. The aim of this study is to analyze the origin of electrographic dysfunction according to the radiologic pattern in patients with PRES and seizures. METHODS: We retrospectively identified 46 cancer patients who developed PRES and seizures at The University of Texas MD Anderson Cancer Center between January 2006 and June 2012...
April 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28284667/center-of-pressure-and-center-of-mass-behavior-during-gait-initiation-on-inclined-surfaces-a-statistical-parametric-mapping-analysis
#3
Marcus Fraga Vieira, Ademir Alves de Brito, Georgia Cristina Lehnen, Fábio Barbosa Rodrigues
This study analyzed gait initiation (GI) on inclined surfaces with 68 young adult subjects of both sexes. Ground reaction forces and moments were collected using two AMTI force platforms, of which one was in a horizontal position and the other was inclined by 8% in relation to the horizontal plane. Departing from a standing position, each participant executed three trials in the following conditions: horizontal position (HOR), inclined position at ankle dorsi-flexion (UP), and inclined position at ankle plantar-flexion (DOWN)...
February 27, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28282992/people-with-chronic-low-back-pain-have-poorer-balance-than-controls-in-challenging-tasks
#4
Rubens A da Silva, Edgar R Vieira, Karen B P Fernandes, Rodrigo A Andraus, Marcio R Oliveira, Leandro A Sturion, Mariane G Calderon
PURPOSE: To compare the balance of individuals with and without chronic low back pain during five tasks. METHOD: The participants were 20 volunteers, 10 with and 10 without nonspecific chronic low back pain, mean age 34 years, 50% females. The participants completed the following balance tasks on a force platform in random order: (1) two-legged stance with eyes open, (2) two-legged stance with eyes closed, (3) semi-tandem with eyes open, (4) semi-tandem with eyes closed and (5) one-legged stance with eyes open...
March 10, 2017: Disability and Rehabilitation
https://www.readbyqxmd.com/read/28269108/human-static-postures-analysis-using-empirical-mode-decomposition
#5
Khaled Safi, Emilie Hutin, Samer Mohammed, Inke Marie Albertsen, Eric Delechelle, Yacine Amirat, Mohamad Khalil, Jean-Michel Gracies
The goal of this paper is to analyze the human stability during static postures using stabilometric signals. The effects of subject's visual input, feet position, age and gender are analyzed. Twenty eight healthy subjects have participated in this study. The center of pressure displacements were measured along the Medio-Lateral (ML) and Antero-Posterior (AP) directions. Empirical mode decomposition method is used to decompose the stabilometric signal into several elementary signals called Intrinsic Mode Functions (IMF)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28237428/slow-release-dexamethasone-in-proliferative-vitreoretinopathy-a-prospective-randomized-controlled-clinical-trial
#6
Philip J Banerjee, Ana Quartilho, Catey Bunce, Wen Xing, Tapiwa M Zvobgo, Nicola Harris, David G Charteris
PURPOSE: To test the hypothesis that adjunctive slow-release dexamethasone implant (Ozurdex; Allergan Inc, Irvine, CA) can improve the outcomes of vitreoretinal surgery for established proliferative vitreoretinopathy (PVR). DESIGN: A 2-year, single-center, prospective, participant- and surgeon-masked randomized controlled clinical trial (EudraCT No. 2011-004498-96). PARTICIPANTS: A total of 140 patients requiring vitrectomy surgery with silicone oil for retinal detachment with established PVR (Grade C) were randomized to standard (control) or study treatment (adjunct) in a 1:1 allocation ratio...
February 22, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28231557/comparison-of-body-s-center-of-mass-motion-relative-to-center-of-pressure-between-treadmill-and-over-ground-walking
#7
Hsuan-Lun Lu, Tung-Wu Lu, Hsiu-Chen Lin, Wing P Chan
Treadmills have been used in rehabilitation settings to provide convenient protocols and continuous monitoring of movement over multiple cycles at well-controlled speeds for gait and balance training. However, the potential differences in the movement control may affect the translation of the training outcomes to real life over-ground walking (OW). The similarities and differences in the balance control between treadmill walking (TW) and OW have largely been unexplored. The current study bridged the gap by comparing the motions of the body's center of mass (COM) relative to the center of pressure (COP) between TW and OW, in terms of the COM-COP inclination angle (IA) and its rate of change (RCIA)...
February 9, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28227334/human-static-postures-analysis-using-empirical-mode-decomposition
#8
Khaled Safi, Emilie Hutin, Samer Mohammed, Inke Marie Albertsen, Eric Delechelle, Yacine Amirat, Mohamad Khalil, Jean-Michel Gracies, Khaled Safi, Emilie Hutin, Samer Mohammed, Inke Marie Albertsen, Eric Delechelle, Yacine Amirat, Mohamad Khalil, Jean-Michel Gracies, Eric Delechelle, Mohamad Khalil, Inke Marie Albertsen, Jean-Michel Gracies, Emilie Hutin, Khaled Safi, Yacine Amirat, Samer Mohammed
The goal of this paper is to analyze the human stability during static postures using stabilometric signals. The effects of subject's visual input, feet position, age and gender are analyzed. Twenty eight healthy subjects have participated in this study. The center of pressure displacements were measured along the Medio-Lateral (ML) and Antero-Posterior (AP) directions. Empirical mode decomposition method is used to decompose the stabilometric signal into several elementary signals called Intrinsic Mode Functions (IMF)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28222191/elderly-fall-risk-prediction-using-static-posturography
#9
Jennifer Howcroft, Edward D Lemaire, Jonathan Kofman, William E McIlroy
Maintaining and controlling postural balance is important for activities of daily living, with poor postural balance being predictive of future falls. This study investigated eyes open and eyes closed standing posturography with elderly adults to identify differences and determine appropriate outcome measure cut-off scores for prospective faller, single-faller, multi-faller, and non-faller classifications. 100 older adults (75.5 ± 6.7 years) stood quietly with eyes open and then eyes closed while Wii Balance Board data were collected...
2017: PloS One
https://www.readbyqxmd.com/read/28220064/effect-of-experimentally-induced-trunk-muscular-tensions-on-the-sit-to-stand-task-performance-and-associated-postural-adjustments
#10
Alain Hamaoui, Caroline Alamini-Rodrigues
It has been shown that increased muscular activity along the trunk is likely to impair body balance, but there is little knowledge about its consequences on more dynamic tasks. The purpose of this study was to determine the effect of unilateral and bilateral increases of muscular tension along the trunk on the sit-to-stand task (STS) performance and associated anticipatory postural adjustments (APAs). Twelve healthy females (23 ± 3 years, 163 ± 0.06 cm, 56 ± 9 kg), free of any neurological or musculoskeletal disorders, performed six trials of the STS at maximum speed, in seven experimental conditions varying the muscular tension along each side of the trunk, using a specific bimanual compressive load paradigm...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28211643/postural-analysis-in-a-pediatric-cohort-of-patients-with-ehlers-danlos-syndrome-a-pilot-study
#11
Claudio Lisi, Serena Monteleone, Carmine Tinelli, Berardo Rinaldi, Giuseppe Di Natali, Salvatore Savasta
BACKGROUND: The Ehlers-Danlos Syndrome (EDS) is a rare disorder affecting the connective tissue. EDS patients may suffer of proprioception and balance impairment but all the studies dealing with such symptoms have been addressed to adult subjects. The Study of such impairment in younger patients may lead to a better awareness of own motor abilities and to a focused rehabilitative intervention. Therefore, our work aims to assess the occurrence of these alterations in a pediatric cohort of EDS patients...
February 17, 2017: Minerva Pediatrica
https://www.readbyqxmd.com/read/28185317/static-postural-stability-in-women-with-stress-urinary-incontinence-effects-of-vision-and-bladder-filling
#12
Daria Chmielewska, Magdalena Stania, Kajetan Słomka, Edward Błaszczak, Jakub Taradaj, Patrycja Dolibog, Grzegorz Juras
AIMS: This case-control study was designed to compare static postural stability between women with stress urinary incontinence and continent women and it was hypothesized that women with incontinence aged around 50 years also have balance disorders. METHODS: Eighteen women with incontinence and twelve women without incontinence aged 50-55 years participated in two 60-s trials of each of four different testing conditions: eyes open/full bladder, eyes open/empty bladder, eyes closed/full bladder, eyes closed/empty bladder...
February 10, 2017: Neurourology and Urodynamics
https://www.readbyqxmd.com/read/28182968/measuring-postural-control-during-mini-squat-posture-in-men-with-early-knee-osteoarthritis
#13
M Petrella, K Gramani-Say, P R M S Serrão, G C Lessi, J A Barela, R P Carvalho, S M Mattiello
Studies have suggested a compromised postural control in individuals with knee osteoarthritis (OA) evidenced by larger and faster displacement of center of pressure (COP). However, quantification of postural control in the mini-squat posture performed by patients with early knee OA and its relation to muscle strength and self-reported symptoms have not been investigated. The main aim of this cross-sectional, observational, controlled study was to determine whether postural control in the mini-squat posture differs between individuals with early knee OA and a control group (CG) and verify the relation among knee extensor torque (KET) and self-reported physical function, stiffness and pain...
February 6, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28159312/effects-of-anterior-offsetting-of-humeral-head-component-in-posteriorly-unstable-total-shoulder-arthroplasty-finite-element-modeling-of-cadaver-specimens
#14
Gregory S Lewis, William K Conaway, Hwabok Wee, H Mike Kim
A novel technique of "anterior offsetting" of the humeral head component to address posterior instability in total shoulder arthroplasty has been proposed, and its biomechanical benefits have been previously demonstrated experimentally. The present study sought to characterize the changes in joint mechanics associated with anterior offsetting with various amounts of glenoid retroversion using cadaver specimen-specific 3-dimensional finite element models. Specimen-specific computational finite element models were developed through importing digitized locations of six musculotendinous units of the rotator cuff and deltoid muscles based off three cadaveric shoulder specimens implanted with total shoulder arthroplasty in either anatomic or anterior humeral head offset...
February 28, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28125270/response-to-tendon-vibration-questions-the-underlying-rationale-of-proprioceptive-training
#15
Anat Vilnai Lubetzky, Sarah Westcott McCoy, Robert Price, Deborah Kartin
CONTEXT: Proprioceptive training on compliant surfaces is used to rehabilitate and prevent ankle sprains. The ability to improve proprioceptive function via such training has been questioned. Achilles tendon vibration is used in motor-control research as a form of proprioceptive stimulus. Using measures of postural steadiness with nonlinear measures to elucidate control mechanisms, tendon vibration can be applied to investigate the underlying rationale of proprioceptive training. OBJECTIVE: To test whether the effect of vibration on young adults' postural control depended on the support surface...
February 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28119231/reliability-and-comparison-of-trunk-and-pelvis-angles-arm-distance-and-center-of-pressure-in-the-seated-functional-reach-test-with-and-without-foot-support-in-children
#16
Sandra Radtka, Jacqueline Zayac, Krystyna Goldberg, Michael Long, Rustem Ixanov
This study determined test-retest reliability of trunk and pelvis joint angles, arm distance and center of pressure (COP) excursion for the seated functional reach test (FRT) and compared these variables during the seated FRT with and without foot support. Fifteen typically developing children (age 9.3±4.1years) participated. Trunk and pelvis joint angles, arm distance, and COP excursion were collected on two days using three-dimensional motion analysis and a force plate while subjects reached maximally with and without foot support in the anterior, anterior/lateral, lateral, posterior/lateral directions...
January 16, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28110044/dopaminergic-modulation-of-multi-muscle-synergies-in-postural-tasks-performed-by-patients-with-parkinson-s-disease
#17
Ali Falaki, Xuemei Huang, Mechelle M Lewis, Mark L Latash
BACKGROUND: Postural instability is one of most disabling motor symptoms in Parkinson's disease. Indices of multi-muscle synergies are new measurements of postural stability. OBJECTIVES: We explored the effects of dopamine-replacement drugs on multi-muscle synergies stabilizing center of pressure coordinate and their adjustments prior to a self-triggered perturbation in patients with Parkinson's disease. We hypothesized that both synergy indices and synergy adjustments would be improved on dopaminergic drugs...
April 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28107239/management-of-pharyngeal-fistulas-after-anterior-cervical-spine-surgery-a-treatment-algorithm-for-severe-complications
#18
Christian Simon, Carl H Fürstenberg, Markus Eichler, Stefan Rohde, Cem Bulut, Bernd Wiedenhöfer
STUDY DESIGN: This study is a retrospective database query to identify all anterior spinal approaches. OBJECTIVES: The objectives were to assess all patients with pharyngocutaneous fistulas (PCFs) after anterior cervical spine surgery. SUMMARY OF BACKGROUND DATA: Patients with the diagnosis of PCFs were treated at the University of Heidelberg Spine Medical Center, Spinal Cord Injury Unit and Department of Otolaryngology (Germany), between 2005 and 2011...
February 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28093258/stooping-crouching-and-standing-characterizing-balance-control-strategies-across-postures
#19
Tyler B Weaver, Michal N Glinka, Andrew C Laing
BACKGROUND: While stooping and crouching postures are critical for many activities of daily living, little is known about the balance control mechanisms employed during these postures. Accordingly, the purpose of this study was to characterize the mechanisms driving net center of pressure (COPNet) movement across three postures (standing, stooping, and crouching) and to investigate if control in each posture was influenced by time. METHODS: Ten young adults performed the three postures for 60s each...
February 28, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28050918/unstable-footwear-affects-magnitude-and-structure-of-variability-in-postural-control
#20
Michael Buchecker, Stefan Wegenkittl, Thomas Stöggl, Erich Müller
This study evaluated the amount, and particularly the structure of variability in postural control accompanying an unstable shoe (US) application. Medio-lateral and anterior-posterior center of pressure (COP) signals, plus electromyographic (EMG) profiles of the tibialis anterior and gastrocnemius medialis were recorded in 29 asymptomatic men while wearing both US and flat shoes (FS). Statistical analysis included common measures of dispersion, as well as sample entropy (SEn) and largest Lyapunov exponent (LyE) estimates...
January 4, 2017: Motor Control
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