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vestibular center of pressure

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https://www.readbyqxmd.com/read/29721226/enamel-evaluation-by-scanning-electron-microscopy-after-debonding-brackets-and-removal-of-adhesive-remnants
#1
Dikson Claudino, Milton-Carlos Kuga, Lauriê Belizário, Jefferson-Ricardo Pereira
Background: The bonding of accessories in the dental crown during the orthodontic treatment creates microporosities, thus promoting micromechanical retention of the adhesive to the enamel structure. After debonding brackets, at the end of the active orthodontic treatment, a certain amount of adhesive remnants must be mechanically removed from the enamel. The objective of this study was to compare, by means of scanning electron microscopy, three different methods to remove the adhesive remnants after orthodontic bracket removal...
March 2018: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/29643816/frequency-specific-fractal-analysis-of-postural-control-accounts-for-control-strategies
#2
Pierre Gilfriche, Véronique Deschodt-Arsac, Estelle Blons, Laurent M Arsac
Diverse indicators of postural control in Humans have been explored for decades, mostly based on the trajectory of the center-of-pressure. Classical approaches focus on variability, based on the notion that if a posture is too variable, the subject is not stable. Going deeper, an improved understanding of underlying physiology has been gained from studying variability in different frequency ranges, pointing to specific short-loops (proprioception), and long-loops (visuo-vestibular) in neural control. More recently, fractal analyses have proliferated and become useful additional metrics of postural control...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29595580/the-use-of-vibrotactile-feedback-during-dual-task-standing-balance-conditions-in-people-with-unilateral-vestibular-hypofunction
#3
Chia-Cheng Lin, Susan L Whitney, Patrick J Loughlin, Joseph M Furman, Mark S Redfern, Kathleen H Sienko, Patrick J Sparto
HYPOTHESIS: People with unilateral vestibular hypofunction (UVH) would have increased postural sway and slower reaction times while using vibrotactile feedback (VTF) during dual-task conditions compared with age-matched controls. BACKGROUND: VTF has been shown to improve real-time balance performance in persons with vestibular disorders. Future use of this technology outside of the laboratory environment as a real-time balance aid requires that using VTF during dual-tasking scenarios be studied...
March 27, 2018: Otology & Neurotology
https://www.readbyqxmd.com/read/29498965/electrocochleography-results-in-patients-with-bilateral-vestibular-paresis-and-sound-or-pressure-induced-horizontal-nystagmus
#4
Katherine D Heidenreich, Crystal M Pitts, Kristen Angster, Trevor Zajac, Shaleta Havard, Tori L Melendez, Paul R Kileny
OBJECTIVE: To describe the electrocochleography (ECochG) findings in patients with bilateral vestibular paresis and sound- and/or pressure-induced horizontal nystagmus. DESIGN: Retrospective case series. SETTING: Tertiary care center. PATIENTS: Three adult patients with bilateral vestibular paresis and sound- and/or pressure-induced horizontal nystagmus were evaluated from 2012 to 2016. MAIN OUTCOME MEASURE: All patients underwent ECochG, vestibular evoked myogenic potential (VEMP) testing, bithermal caloric testing, rotary chair testing, audiometric testing, and temporal bone computed tomography (CT)...
April 2018: Otology & Neurotology
https://www.readbyqxmd.com/read/29494625/on-the-effects-of-signal-processing-on-sample-entropy-for-postural-control
#5
Anat V Lubetzky, Daphna Harel, Eyal Lubetzky
Sample entropy, a measure of time series regularity, has become increasingly popular in postural control research. We are developing a virtual reality assessment of sensory integration for postural control in people with vestibular dysfunction and wished to apply sample entropy as an outcome measure. However, despite the common use of sample entropy to quantify postural sway, we found lack of consistency in the literature regarding center-of-pressure signal manipulations prior to the computation of sample entropy...
2018: PloS One
https://www.readbyqxmd.com/read/29468616/does-focal-mechanical-stimulation-of-the-lower-limb-muscles-improve-postural-control-and-sit-to-stand-movement-in-elderly
#6
G Attanasio, F Camerota, M Ralli, G Galeoto, G La Torre, M Galli, M De Vincentiis, A Greco, Claudia Celletti
BACKGROUNDS: Imbalance in elderly is a common problem strictly related to fall. AIMS: This study investigates the possibility that a new protocol based on the focal mechanical muscle vibration may improve balance and stability in elderly. METHODS: Pre-post non-randomized clinical trial has been used. Patients referring postural disequilibrium with negative vestibular bed-side examinations have been treated with focal muscle vibration applied to quadriceps muscles and evaluated before and immediately after therapy and after 1 week and after 1 month with postural stabilometric examination and with an inertial measurement units during the time up and go test...
February 21, 2018: Aging Clinical and Experimental Research
https://www.readbyqxmd.com/read/29464154/v-shaped-internal-nasal-vestibular-flap-for-reconstruction-of-iatrogenic-columellar-defect
#7
Sara Tanini, Giulia Lo Russo
Columella is an important structure in the center of the face, and its structural integrity has an important functional, social, and psychological role. Columella reconstruction can be very challenging for surgeons and the ideal technique remains elusive. This article describes a reconstruction technique in a young woman with columella necrosis due to nasal continuous positive airway pressure treatment. The method of reconstruction described here, with a V-shaped internal nasal vestibular flap and a cartilage grafts from lateral crura, is simple and easily reproducible, providing an optimal aesthetic result and in addition the donor site does not create a secondary deformity by disrupting normal anatomy...
January 2018: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/29409404/infant-sitting-postural-control-appears-robust-across-changes-in-surface-context
#8
Elena Kokkoni, Joshua L Haworth, Regina T Harbourne, Nicholas Stergiou, Anastasia Kyvelidou
AIM OF THE STUDY: Independent sitting requires the control of the involved body segments over the base of support using information obtained from the three sensory systems (visual, vestibular, and somatosensory). The contribution of somatosensory information in infant sitting has not been explored. To address this gap, we altered the context of the sitting support surface and examined the infants' immediate postural responses. MATERIALS AND METHODS: Ten 7-month-old typically developing infants sat on compliant and firm surfaces in one session...
December 2017: Somatosensory & Motor Research
https://www.readbyqxmd.com/read/29288047/sway-regularity-and-sway-activity-in-older-adults-upright-stance-are-differentially-affected-by-dual-task
#9
Margarita Drozdova-Statkevičienė, Vida Janina Česnaitienė, Kazimieras Pukėnas, Oron Levin, Nerijus Masiulis
Age-related changes in postural control are attributed to visual, vestibular and proprioceptive dysfunctions, muscle weakness, and reduced availability of neural resources required for efficient balance control. Concurrent performance of complex cognitive tasks while standing or walking is expected to increase balance instability due to under-recruitment of brain resources and insufficient allocation of attention to the postural task. Both balance instability and attentional control of movements can, nonetheless, be determined from the center of pressure (CoP) measurements by examining the effects of dual-task on the amount of sway activity (as measured by CoP velocity - Vcop) and the statistical regularity of the CoP trajectory (the wavelet entropy of the signal - WEcop)...
February 14, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29239806/development-of-postural-control-and-maturation-of-sensory-systems-in-children-of-different-ages-a-cross-sectional-study
#10
Cristina Dos Santos Cardoso de Sá, Catarina Costa Boffino, Renato Teodoro Ramos, Clarice Tanaka
OBJECTIVE: To evaluate the stability, postural adjustments and contributions of sensory information for postural control in children. METHODS: 40 boys and 40 girls were equally divided into groups of 5, 7, 9 and 12 years (G5, G7, G9 and G12). All children were submitted to dynamic posturography using a modified sensory organization test, using four sensory conditions: combining stable or sway referencing platform with eyes opened, or closed. The area and displacements of the center of pressure were used to determine stability, while the adjustments were used to measure the speed of the center of pressure displacements...
January 2018: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/29161921/foam-pad-of-appropriate-thickness-can-improve-diagnostic-value-of-foam-posturography-in-detecting-postural-instability
#11
Bo Liu, Yangming Leng, Renhong Zhou, Jingjing Liu, Dongdong Liu, Jia Liu, Su-Lin Zhang, Wei-Jia Kong
OBJECTIVE: The present study investigated the effect of foam thickness on postural stability in patients with unilateral vestibular hypofunction (UVH) during foam posturography. METHODS: Static and foam posturography were performed in 33 patients (UVH group) and 30 healthy subjects (control group) with eyes open (EO) and closed (EC) on firm surface and on 1-5 foam pad(s). Sway velocity (SV) of center of pressure, standing time before falling (STBF) and falls reaction were recorded and analyzed...
November 21, 2017: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/29079459/effect-of-noisy-galvanic-vestibular-stimulation-on-center-of-pressure-sway-of-static-standing-posture
#12
Yasuto Inukai, Naofumi Otsuru, Mitsuhiro Masaki, Kei Saito, Shota Miyaguchi, Sho Kojima, Hideaki Onishi
BACKGROUND: The vestibular system is involved in the control of standing balance. Galvanic vestibular stimulation (GVS) is a noninvasive technique that can stimulate the vestibular system. In recent years, noisy GVS (nGVS) using noise current stimulation has been attempted, but it has not been clarified whether it affects postural sway in open-eye standing. OBJECTIVE: The purpose of this study was to clarify the influence of nGVS on the center of pressure (COP) sway measurement in open-eye standing postural control and identify the responders of nGVS...
January 2018: Brain Stimulation
https://www.readbyqxmd.com/read/28991916/the-essential-role-of-optical-flow-in-the-peripheral-visual-field-for-stable-quiet-standing-evidence-from-the-use-of-a-head-mounted-display
#13
Kentaro Horiuchi, Masami Ishihara, Kuniyasu Imanaka
It has long been thought that vision is the most essential factor in maintaining stable quiet standing compared to other sources (i.e., vestibular and somatosensory inputs) of information. Specifically, several vision studies on postural control have shown evidence for the importance of the visual system, particularly peripheral vision rather than central vision, and optical flow. Nevertheless, to date, no study has manipulated both visual field and optical flow concurrently. In the present study, we experimentally manipulated both the visual field (the central and peripheral visual fields) and the occurrence of optical flow during quiet standing, examining the effects of the visual field and optical flow on postural sway measured in terms of the center of pressure (CoP)...
2017: PloS One
https://www.readbyqxmd.com/read/28931974/gaze-stabilization-exercises-derive-sensory-reweighting-of-vestibular-for-postural-control
#14
Yusuke Ueta, Akiyoshi Matsugi, Kosuke Oku, Kojiro Okuno, Yoshiki Tamaru, Shohei Nomura, Hiroaki Tanaka, Shinya Douchi, Nobuhiko Mori
[Purpose] The aim of this study was to investigate whether gaze stabilization exercise derives sensory reweighting of vestibular for upright postural control. [Subjects and Methods] Twenty-three healthy volunteers participated in this study. The center of pressure of the total trajectory length was measured before (pre), immediately after (post), and 10 min after (post10) gaze stabilization exercise, in the static standing position, with the eyes open or closed, on the floor or on foam rubber. The sensory contribution values of the visual, somatosensory, and vestibular systems were calculated using center of pressure of the total trajectory length value in these measuring conditions...
September 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28919878/postural-control-in-bilateral-vestibular-failure-its-relation-to-visual-proprioceptive-vestibular-and-cognitive-input
#15
Andreas Sprenger, Jann F Wojak, Nico M Jandl, Christoph Helmchen
Patients with bilateral vestibular failure (BVF) suffer from postural and gait unsteadiness with an increased risk of falls. The aim of this study was to elucidate the differential role of otolith, semicircular canal (SSC), visual, proprioceptive, and cognitive influences on the postural stability of BVF patients. Center-of-pressure displacements were recorded by posturography under six conditions: target visibility; tonic head positions in the pitch plane; horizontal head shaking; sensory deprivation; dual task; and tandem stance...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28822327/improvements-in-balance-control-in-individuals-with-pcs-detected-following-vestibular-training-a-case-study
#16
Alyssa Prangley, Mathew Aggerholm, Michael Cinelli
Concussed individuals have been found to experience balance deficits in the anterior-posterior (AP) direction as indicated by greater Center of Pressure (COP) displacement and velocity. One possible reason for this change in balance control could be due to damage to the lateral vestibulospinal tract which sends signals to control posterior muscles, specifically ankle extensors leading to compensatory torques about the ankle. The purpose of the study was to quantify balance assessments in individuals experiencing persistent post-concussion symptoms (PCS) to determine balance control changes following a vestibular training intervention...
October 2017: Gait & Posture
https://www.readbyqxmd.com/read/28802368/study-of-the-effects-of-hearing-on-static-and-dynamic-postural-function-in-children-using-cochlear-implants
#17
Malihah Mazaheryazdi, Abdollah Moossavi, Javad Sarrafzadah, Saeed Talebian, Shohreh Jalaie
OBJECTIVE: The present study aimed to evaluate the postural control perturbations by the center of pressure parameters in two main approaches, cochlear implant turned "on" and "off". METHODS: We included 25 children aged 8-10 years with unilateral cochlear implants and bilateral vestibular hypofunction deficit. To evaluate the postural function, each children was asked to stand on the force plate under 3 different conditions and cochlear implant turned "on" and "off": Condition (A) double stance from open eyes to closed eyes, Condition (B) double stance with open eyes engaging in the dual task and Condition (C) From double leg stance to one leg stance with open eyes for assessment of dynamic postural control...
September 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28783491/adaptation-of-postural-recovery-responses-to-a-vestibular-sensory-illusion-in-individuals-with-parkinson-disease-and-healthy-controls
#18
Mark E Lester, James T Cavanaugh, K Bo Foreman, Scott W Shaffer, Robin Marcus, Leland E Dibble
BACKGROUND: The ability to adapt postural responses to sensory illusions diminishes with age and is further impaired by Parkinson disease. However, limited information exists regarding training-related adaptions of sensory reweighting in these populations. METHODS: This study sought to determine whether Parkinson disease or age would differentially affect acute postural recovery or adaptive postural responses to novel or repeated exposure to sensory illusions using galvanic vestibular stimulation during quiet stance...
October 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28767021/the-limits-of-stability-in-patients-with-unilateral-vestibulopathy
#19
Rafael Alvarez-Otero, Nicolas Perez-Fernandez
OBJECTIVE: To characterize the stability limits and region in patients with unilateral vestibulopathy according to the side of the lesion and determine if that imposes any bias. To analyze if the stability limits and region depend on the functional deficit as evaluated in the sensory organization test. METHODS: Forty patients with chronic dizziness and without any vertigo spell for least 6 months prior to testing. In all of them, a unilateral vestibulopathy was diagnosed clinically and at vestibular testing...
October 2017: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/28687471/does-the-postural-variable-affect-the-determination-of-balance-compensation-level-in-vestibular-schwannoma-patients
#20
Julien Frère, Charles P Hoffmann, Gérome C Gauchard, Cécile Parietti-Winkler
Previous sensory organization test (SOT) outcomes provided evidences that the vestibular schwannoma (VS) removal led to acute and slow changes in the ability to use vestibular cues for balance control. However, the assumptions behind the equilibrium score (ES) are somewhat controversial within the literature. Therefore, we compared the time-course of balance control in eighteen VS patients across different postural variables. Analyses of variance and unsupervised clustering (k-means) were used to compare the whole dataset of four postural variables: ES, a modified ES which factored in the time before a fall (cES), the mean amplitude (MA) and the mean velocity (MV) of center of pressure displacements...
July 4, 2017: Medical Engineering & Physics
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